How to open a screwback watchcase with a Horotec 07.363 Maxipress watchcase opener. This particular watchcase opener is very useful for screw casebacks that are very hard to open as it provides a lot of leverage. This package from Horotec contains an adjustable tool for most casebacks (as used in the video), a set of Rolex caseback dies, a set of Baume and Mercier dies, and a set of friction dies. Other specialty dies can be purchased for this unit as well. For example I did purchase a Brietling die for this machine as well.