Class project - adapter for small motor

[Travelover]

OP here.

Well, I got really lucky. Looking through my junk box, I found a piece of plastic tubing. I found that if I cut off a 1/4" piece then stuffed it into the propeller hub hole, it compressed the center enough so that it is a slight press fit onto the motor shaft.

Thanks for all the creative suggestions. Now my wife is gonna be happy with me.