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makes perfect sense ! Simple high school physics v= r.w where v is tangential velocity and w is angular velocity with radius r! What puzzled me re: the Longines balance was that there are two nuts with a screw slot which are half cut on the ends! I was wondering if it is a sliding change or a rotational change because of the half cuts in the nuts! Maybe someone who has worked on these may sing out? If it is a sliding change you would have to be incredibly skilled to get them both at the same distance from the centre as any microscopic difference could cause a wobble in the balance wheel or never get the timing right either unless this process also uses a special too too! I totally empathise with you! You are not alone? I also gave up on them myself! It can be a very laborious task! Can you live with the results you have achieved? Wear the watch and see how it goes with your life style movements! You will change positions as you move troughout the day, so the variation will change and hopefully for a better average! If the variation is small I would stop playing around with it as you could make it worse! I would stop playing around with that stud bock rotation as they can break as they are epoxied to th hair spring if it makes you fell better - consider that if professional watchmakers refuse to work on this, then keep up the zeal! If you can get a generic complete bridge and balance replacement, buy a couple of them as they would have been already factory timed and surely you increase the odds by 50% in getting one that will not fall apart! Sorry if this may sound cold comfort! As Freddy has said, getting them properly centred is the aim of proper regulation! In some cases it is also luck like getting beat error to be exactly zero!! Better still - Getting that winning number in your lottery changes your life forever! I would attempt the latter!

Longines uses a similar setup with a modified eta balance where the two screws on the balance spokes are adjusted with some fine screw driver! I am not sure which direction is for speeding up or slowing down but I believe it works on centripetal forces on the weight of the balance wheel when adjusted!

Ditto ditto ditto! you can definitely say that again!! For the life of me, I do not know why these are not sold as a complete (genuine ) bridge with balance already assembled as they do with the generic ones! Even on the second hand market on eBay, I see that they disassemble them and sell them separately as a separate bridge and a separate balance! Yes they are definitely tricky to time! Even more reason to avoid them as separate components because any watchmaker that would spend an hour to regulate them would have to charge big$$$$ otherwise he would starve! As it has been said in the past, neither the watchmaker nor the customer ca afford it! I have also noticed that professional watchmakers try to avoid this either because of what is involved or that very few actually know how to time them! I love the etachron and yes I agree that if timed correctly, their accuracy is almost flawless! I like it even better than the goofy setup by Rolex that uses the micro stellar complication , where again you would need a special tool to time them and I do not see any special benefit! I have a genuine 16610 that was serviced by Rolex in the past and timing was nothing special! In fact my eta noobmarier runs circles over it in accuracy! Therefore, I have come to my conclusion that if I screwed up a hairspring on any eta movement, I would just replace the movement and keep the other one as a spare! Saves money and sanity! Unless you are bored in a nursing home or in jail, by all means spend the whole day trying to time them! I would rather work an extra day of overtime and end up buying 2 new movements for that effort! yeah, a good learning experience but also a very impractical one too, especially for non professionals such as myself! You might be able to make your own tool to time them but again if you have nothing better to do! if it helps, the following link is the only video link I know that eloquently shows how to remove a balance from a bridge, replace it and time it! This guy is magic and amongst my favourite on YouTube ! He tells you what others don’t tell you! Yet it looks like a hit or a miss to me! Worth watching if this etachron is haunting you!