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If you can wind the watch right up, then the mainspring has not broken. if it had broken as you say you would be able to wind it for evermore. Depending on the movement, sometimes you are able to just remove the barrel bridge to access the barrel and replace the spring. Myself I never liked this way because you will dislodge dirt that can get into the train and it will stop the watch. It is always best to do a complete clean.

Hi C Yes you said it, winds to full resistance. Release the reserved power through the click, rewind and repeat several times, you should get to full wind by same number of smooth turns, about 20 to 30. If broken , it turns indefinate as you said or wind some and suddenly discharges the reserved power, depending on the length of broken piece.

You’re most welcome! I enjoy the challenge. There’s one here too http://www.oltenwatch.com/product.php?productid=18862 One day I will write a list of how to find watch parts!!

Thanks Stuart- I can't imagine why I didn't think to check Watchguy's listing. I've sent an inquiry to him today.

Check with this company. They have a lot of parts. https://mccawcompany.com/

Tissot have a new movement based on the 5100 also C01.211 . Maybe that is easier to find parts for?

I have a very limited experience from movements like these compared to Swiss movements.Lately I have mostly worked on TIMEX watches since they are common here too. One have to admit they are just ingenious in their simplicity, even they are made out of pressed sheet metal they mostly after a service starts ticking, not the most accurate but still considering the construction impressive. I have begun to buy all kinds of pin lever escapements too. For some reason I get amused of the challenges they present. If one is interested in learning about the effects of side and end shake they are a joy to observe. In a fault finding perspective they mostly offer a greater challenge too. Thank you for your response and keep up with the great work...

Hello, I just did the same work to my skagen chronograph quartz and the crystal had a thin gasket around it that was set with mastic / UV glue. The gasket was not salvageable but the crystal went back into the bezel just fine with UV glue. Hope this helps.

The sound itself relates to the source, apart from which is visual check the suspected source. Two sources can commonly be refered to as winding sound. The auto winder, the gears in auto winder mech can be seen turning to produce the sound. It sounds the same as auto winder commonly makes, just observe the auto mech( rotor and winder module) as you hear the sound. The manual wind sound is generated by cluch mech and click, check if the return bar completely disengages the pinion and castle gears. the ratchet wheel should not turn as stem is turned in anticlock direction( if that is what you refer to" unscrew " ) Winder module is a train transferring power from the rotor to mainspring. The train consist of reversers and set of reduction gears.refer to eternaltools.com for picture of components and their names on eta movements. 7750 commonly called valjoux is differemt design but it two got a bidirectional winder so reverser applies. Hope I havn,t bemused you as I have myself. Regards joe

The following aproach to safe cab jewel removal, if not entirely eliminate loss of cab jewels, will greatly reduce such incidents.Suitable for pre-cleaning. The first picture is just to show angle of attack to unlock ETA cab springs , the actual removal is done inside a bag. The second picture shows angle to lock the spring. Third shows you actually put the movement inside a transparent bag. Stick sharp point into the bag to reach inside. Remove the cab. The cab is contained in the bag, No where to fly out of the bag, you can then dump the cab in your cleaning solution container. Looking forward to no longer read someone lost a cab.

I have very limited experience. Bought a fairly cheap microscope. Images are pretty cool!! Where the money is the WORKING DISTANCE. If you want to work on the movement while looking on the microscope then you’ll have to invest in a serious scope. Sent from my iPhone using Tapatalk

Hi guys, Turned out the problem was actually that the setting lever spring / plate was not lying completely flat, making the calendar ring rub against it. When that was corrected, everything was smooth again.. Another stupid error and learning experience... Stian

What can happen and has happened to me is if you fit the wrong screw when assembling the escape side it is proud on the dial side and stops the calendar ring moving.