Want to install a 5mm bore pinion on your 3.2mm motor shaft?  Just add this machined adapter and your pinion will slide right on!  Align the hole in the spacer with the flat of the motor shaft, then use the pinion set screw to tighten down lie normal!  This allows you to add the larger Mod1 pinions to your motor with ease.

Note:  You will receive a single adapter.