Cordage winding gearbox

Planning on making a bow string from rawhide (rabbit skin). Need to wind two ends the same way round until they twist together and by clamping this in a vice with a drill attached, I should be able to control the tension.

Printed in PETG and gears cleaned up in a lathe to remove supports. Cuphooks screwed into driven gears and a woodscrew with the end cut off into the drive gear - this can be chucked into a drill. You could bolt a thin screw (M4 for example) through the drive gear and chuck t