Gear for 2.3mm shaft engine

I've got a very small ~5$ motor with 2.3mm shaft so I've made a small remix and share with You
Shaft might be also stabilized with a screw on side
I prepared 3 versions: no whole, 1,5mm and 2,0mm

My ultra cheap setup:
motor: https://s.click.aliexpress.com/e/_ExA3zUl
cooling: https://s.click.aliexpress.com/e/_EGwTT8d

smaller shaft diameter : 2.3mm

stabilization whole on side