Driveshaft?
I know how to make a driveshaft. Go to a hobby shop that sells real r/c cars and buy the straightest antenna tube they have. Cut it to length annd then use an X-acto to cut a flat spot(creating the D-shaft) and then for added strenght CA glue the shaft to the gear. I used this method to make light weight driveshafts for my old skyline.
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