I assembled my watch without any problems. The second hand was trying but it all went together and worked. The watch ran fine. I put it on my wrist and it then stopped working. I unassembled it and put it back together but it still won’t run.
John.
Does it run when it’s out of the case but stop when it’s inside the case? If so the second hand is set too high and it’s touching the crystal. Try setting it lower in this case.
@NotBHI has it right. This is the fun part of building; figuring out why it works or doesn’t work. Does it run outside of the case? Does it run with no hands? Once you figure out the conditions of when it does or does not run, the WHY should be easier to pinpoint.