Clutch for automotive windshield wipers servo

I got a shield wiper from a VW T3 Bus for little Money. So i decided to start to build a Filament Extruder, which should be controlled with a c-mos cam in a cascade control (for Filament thickness). I need much torque, so the nema servos were quite too expensive or were a little bit to weak.

As i saw the wiper servo, i designed a Clutch especially for the conical gearing. It is a pot solution containing two parts:

1) is fastened on the shaft of the servo (with inside the conical gearing)