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I just ran across this YouTube video by a German Watchmaker named Philclock. Since he is in Germany the lathe is called a VECTOR but it is actually the same lathe as the Sincere.

Hi rogart63, No, it's really the balance jewel, I have attached a photo from the bottom side with the cap jewel plate removed. It's apparently one of these domed jewels that I understand are used for balances. Let me see what I can find and achieve with parts from Cousins first. If that fails I will be pleased to get back with you for a potential spare. I believe you are Swedish as well, or...? Sent from my iPad using Tapatalk

The staking set is a K&D Inverto no. 18 and you are absolutely right, when I read a bit more carefully on one of the sites that show up when googling, it mentions that some were fitted with a friction jewelling add-on. I got the set compraratively cheap from ebay with the seller stating that it would require some cleaning. And that was correct, all the stakes needed a long soak in some rust removing liquid and opening the wooden cover still lets out a very pungent smell :-) I guess it's just to hammer away and see how it goes... Regarding the blow-up picture, I use a very simple method; my iphone or ipad (this one was with the ipad) and a loupe of some strength held in front of the camera lens. Works surprisingly well. Sent from my iPad using Tapatalk

Yep, this is true. Acrylic crystals WITHOUT a tension ring can be used with the claw tool. The ones WITH a tension ring will need a press. It won't damage the crystal as it's basically a press fit crystal.

Manually winding an automatic should be of no detriment to the watch at all if it has had regular servicing. Any vintage auto could develop problems from not being serviced and manually winding, If the automatic gears have seized due to old oil hardening or no oil at all causing the rotor to spin as you manually wind putting strain on the gearing. With autos I usually wind to the point of getting it running just a few turns of the crown then wear it as normal there should be no need to wind it fully via the crown.

This style is not used with a crystal that has a tension ring. I guarantee you will break the crystal with it. You need to use a press.

Only my opinion. But I think the watch is very pricey for a quartz and if you really want one look for a used model. Agree with "Oldhippy" about the bracelet. At the price advertised you could buy a very decent Seiko Automatic that would probably have a far better resale value, if you ever wanted to trade up. Sent from my SM-T585 using Tapatalk

The first thing I would do is take it out of its case and see if it runs OK. Is it stopping at the same place, if so check the hands, make sure they are free from obstruction. Run the watch with the dial and hands removed. Are you using the correct screws for the parts? Do exactly as clockboy has said. As it is a two-barrel movement, did you put the barrels back together using the exact same parts as when you took it apart. I know it sounds silly but sometimes it can make a difference.