Quick Q&A #004. Can Watches Be 100% Accurate? Seiko 7009 problem. Beat Error.

Watch Repair Course: https://www.watchrepairlessons.com/

This quick Q&A covers various subjects introduced via questions left below in the comments.

Can a watch be 100% accurate?
Does beat error affect the rate of a watch?
Seiko 7009 has loose hands – seconds hand runs but minute and hour doesnt.


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CNCStitcher says:

Love the videos Mark, please keep them coming mate

Sheriff Nobel says:

Im just new in the field hh expect some bothering later thnx alot

Chris Anotherwan says:

Hi Mark, Im wondering if it’s damaging for a watch to be set counterclockwise? For example it runs a little too fast and I want to set it back by a minute or two.

Imtiaz Ali says:

My watch rotor spins freely without any friction like my other watches. Is this a problem ?

thisisbadstuff says:

Hi Mark,
I barely begun tinkering with watches and I have a bit of a technical question. In this video about dynamic poising at around 30:30,
a watchmaker, if I understood correctly, explains nudging the hairspring in a way that shifts the mass of the hairspring away from the heavy spot. Is this a legitimate practice? What problems, like buggering up the end curve, could this cause if any? If I move the regulator all the way to the fast end of the end curve before shifting the hairspring could this prevent ruining the end curve?

I take a keen interest in this solution because I have a cheap seiko 4r36 I would like to try this on. I don’t want to drill at the balance because the regulator is biased towards the – sign and if I get too carried away I’m afraid I might run out of hairsrping to slow it down. Also I’ve heard from multiple sources that hairsprings in these movements shouldn’t be lifted off of the balance so static poising and hairspring truing seems to be out of the question. There’s about a 20 second max difference between some positions which is apparently within specification for this movement but I would like to see if I can’t do any better.

Another question I have is what’s the fuss about getting the hairspring to touch either curb pin or boot in various positions? Is it bad to just have it touch both all the time providing the terminal curve is aligned perfectly with respect to the travel of the regulator?

Thank you very much in advance!!!!!

Jaakko Oksa says:

I have built a quartz wall clock which utilizes an oven-controlled quartz oscillator, and should be accurate to 1 second per year or better. I am not certain of the eventual accuracy because I’ve been observing it’s accuracy for the past six months in order to be able to calibrate it.

Shawn B says:

Big fan of your videos, Mark!
How long does it take to produce one of your servicing videos? How much longer does servicing a watch take when you’re filming the process?

Imtiaz Ali says:

Is it possible to fix off centered date view to show in the middle of the date window?

Tony Bennett says:

Nice to hear the audio on the strange noise from the previous video.

Pete's Garage says:

This is going to be an odd comment but I’ve been watching your videos mostly because I’m amazed by the inter workings of mechanical watches, I like to see how things work. But watching your videos just helped me fix my toaster oven, the timer was not working and upon removal I noticed even when set the balance wheel had no action. On closer inspection I found that the hairspring had come out of its holding notch on one end. I reinstalled it and I’m back in business! Thank you for your videos sir!

Petteri Heino says:

Thanks for these great videos!

Leo Yeung says:

Nice informative Video as usual Mark

Adrian Gunawan says:

Hi thank you for the information. I have 2 question for you. When a non hacking watch pulled into time setting position, and the crown twisted backward a little bit, sometimes the second hand move backward a few seconds. Is it normal? Can I swim with my vintage rolex (or any vintage watch for that matter) if I have pressure test it and change the seals?
Thank you sir!

David Berndt says:

Thanks Mark! Loving the the Q&A.

Tony Hill says:


Allen Russell says:

Love your videos. I’m a hobbyist and you’ve helped more than you can guess.

Martin Pease says:

Dear Mark, your videos have captivated me from day one. I consider myself to have the skills to start basic repairs on watches, your channel is a key reason for that. Please, would you give us a list of indispensable tools etc. in a beginners kit. Thank you for everything. Kindest regards, Martin K Pease.

behinderteleberwurst says:

Nice one, thanks for including the “strange sound”.
I have a question, as well: I own a watch with an ETA 2824-2 and I’m wondering whether it’s normal for the crown to be winding up the movement while I’m screwing it down or if that’s something that should be checked out.
Some of the (different) movements in my other watches can be hand-wound when the crown is unscrewed, but they don’t wind up _while_ the crown is being screwed down.
It’s a brand new watch, too.

shahin the boy says:

Sir how to fix the broken dial legs ??

smashie2000 says:

Hi, I’ve got a question with regards to tightening the cannon pinion, Why not use a pair of D tweezers and set the pinion onto a 5 sided English cutting broach? There is no mechanical advantage in the tweezers (which the lever of the tool has) and the broach will only allow to one part of the pinion to be gently squeezed? I’d be interested to hear your thoughts. All the best and keep the videos coming Mark.

scuba453 says:

Hi I was wondering what your thoughts are on Seiko’s Spring Drive? Do you like it? I guess the main issue is that only Seiko will be able to service them.

Jessica Lach says:

I work at a watch repair shop and really enjoy it! I do mostly battery changes and other minor external repairs, though. Nothing too in-depth with the movement. I’d love to be able to make a career out of watch repair, but how do I go about doing that without going to some fancy watchmaking school? Is there a way to become certified in watch repair without having to uproot my life and move to Switzerland, Dallas, or Miami?

Valkman RC says:

I have a watch that I want to change the hands on as they are hard to read. Before I get the parts I would like to know your expert advice. The question I have is how would you go about removing the snap down bezel. The watch in question in a Filippo Loreti venice auto.

Michael Bolton says:

My question would be to you Mark, what watches do you wear? What’s your everyday watch ?

Funny for me to watch this video when I have only today solved the same issue of hands not turning . That was before I watched this! I could have saved myself allot of thinking time!!
Keep up the good work sir!

Mentorcase says:

That sound sample, was it the loose screw rubbing that I could hear in the first sound? I have a pulsar digital now that I have had for over 20 years, I replaced the movement a couple of years ago as it has digital and analogue hands and it keeps accurate to a couple of seconds a year, the old movement was 100% accurate, I also have a cheap watch I used when I was having the pulsar crystal glass replaced and it is 100% accurate over a year.

Dirk Stabins says:

I’m always amazed when I see all those tiny parts inside a watch moving together so perfectly.

Andreas Ziakas says:

Hello Mark, i wanted to ask you if you ever had repaired a tuning fork movement (like bulova’s)
I found a Bulova Accutron Spaceview swiss made with 2141 movement in a box at my grandfather’s workstation as he was watchmaker, i put the 394 battery (the battery didn’t have the plastic thing around it) and the watch started to hum but the second hand didn’t move, i tried to knock it a little on the 9/3 positition as seen on a bulova information page but nothing happened

Joe Esparza says:

Love the video Mark . Ever thought about doing a comparison video, part per part ,up close between a Sea-gull 6497 and Swiss Eta ( Unitas ) 6497 or lets say, between Swiss eta 2824-2 compared to Sea-gull’s ST2130?

Perforator2000 says:

Why is it that movements like the ETA 2824 will sometimes fail to stop the seconds hand when the crown is pulled into the setting position? Is the sliding pinion not fully engaging the setting gear, meaning the hack hasn’t reached the balance wheel?

jose mongua says:

friend is missing in your videos calibres like 7006, 7009 disarmed and armed would be good I would watch something so are very common models of seiko

Vinay says:

How shock resistant mechanical watches are? Could they survive shocks from activities like riding motorcycle and shadow boxing? And I can’t imagine how the tiny balance spring and balance wheel can be made to endure shocks.

black John says:

At a young age I also used to repair the clock, now this is a lesson in the past, but still I’m not indifferent to watch and repair them, I watch Marka video.
At home lie the wristwatch, in which the lower balance needle has broken. On Ali bought a balance, but, his spiral is twisted in the other direction, the balance that is needed there was not. The spiral must be removed from the balance, turned over and put in place, and I do not have a suitable tool for such an operation.
I apologize for the translation.

Majed Almalki says:

Hey Mark, love your videos. Two questions (3?): 1- which movement do you hate servicing the most, and one you love the most and why? 2- what was the most complicated movement you ever worked on?

Thanks in advance!

Stephen Meade says:

If you could design your own movement, from a mechanical viewpoint what features/complications would you include?

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