The watch movements have some bearing jewels.
The main reasons are for:
- To move wheels smoothly without friction and transmit power efficiently.
- To prevent wear of wheel’s pivots.
If a hole jewel has chip or crack, the pivot will make damage.
The jewel has chip around the hole.
The chipped jewel has been taken out.
Reaming the hole for a replacement hole jewel.
The most important thing for the job is keep the center.
The new hole jewel has been replaced.
Completed!