This is my version of an propeller cutter for a Proxxon mini drill (the German real Dremel ;) ). It has holes for 3", 4" and 5" bullnose. The photo shows my old drill, which ha not the standard 20mm collar. Use a M6x25 screw and nut for the collar press. Version 1 needs a M5x40 and some nuts, as seen in the picture. This was not very handy, so I just designed V1.2 and V 2. Version 1.2 was build for a M4x40 Screw and has a 2cm adapter. Version 2 has not been tested yet. It is also for a M4 screw.