Used where a thread on an existing stem (wrist or pocket watch) has broken short enabling use of the existing crown or the thread tap size needs to be changed to be able to fit an alternative crown.
- Extend your existing stem
- Change stem thread to a smaller or larger tap size
- Popular starter sets available
- Male & female extensions for 2 part stems
- Tap 5 (Ø0.50mm) to Tap 14 (Ø1.40mm)
- Swiss Made