Most visitors online was 1660 , on 12 Dec 2020
They do align perfectly. I have not inspected the motor, as I’m not a professional or hobbyist at repairing them. I could take some photos if possible to get quality close ups. I’ll measure the chain today and post a photo.A known good chain is 72 balls per foot with every 7th ball repeating every inch. Curious how your chain deviates from this? (it's very simple to measure). Or simply place your chain in the motor and dial divit's and see if they fit perfectly. (ie bottom out and centered in each divit)
Have you inspected the motor's drive gear? Are the little divit's clean? If they are built up with dirt/debris that would increase the gear's O.D. slightly and that might make it run slightly fast. Non OEM chain can also cause all sorts of issues.
I find it hard to believe these chains actually stretch with such little weight of the dial. But I could be wrong.
Wow...As the clock operates, the balls climb out of the sockets. and eventually jump a socket on the dial disk. I've taken the dials apart and scrubbed the disk socket track, and used a silicone spray, that I happened to have within reach, and sprayed it into a cap and used a brush to apply to the track. I also did the chain, and then wiped it down.
I made up a chain from pull chain for a light switch, It seemed the same size. It's not easy to open a ball . I used a razor and determination. You will have to make the two ends you join, have the links free and carefully close the ball to capture the link ends.
There is a company out east that sells chain and the open balls. I thought about making and selling them, but I have too much on my plate. They actually have a tool for closing the balls, but you can do it , with judicious use of pliers. The real tool, that I have seen, is made from pliers with parallel operating jaws, and have cups machined into them to register and receive the open ball.