Very few!
You might be able to do the conversion with just a caseback opener and a pair of tweezers but we recommend a few more tools for easy installation.
- Caseback opener
- Tweezers
- Watch Case cushion
- Watchmakers knife/caseback tool for bezel removal
- Basic crystal press for installation of Seiko type bezel
- Rodico or an air blower in case dust gets on watch dial or crystal
That’s all you need!