Back in the 1970's when starters were expensive, I turned a starter cone on the lathe in 8th grade shop class and bolted it onto the shaft of an old automobile starter motor, wired the whole works to an NO pushbutton switch with lamp coard and taped the switch to the side of the starter motor with a lot of friction tape. I still had to buy the rubber insert.

I ran accross the thing a few years back and found I could put the cone on a 3/8" carriage bolt for a mandrel and then chuck it up in my Makita drill. A 9.6 volt Makita drill, in low gear, can turn a .40 with enough energy to start, but frankly it is not worth the effort. Starters have gotten pretty cheap. The cheapest ones have plastic housings that break if you drop the starter on the tarmac, but otherwise, they last quite a while.

The more expensive ones last forever and stand up to serious abuse. Mine is an old Royal with ball bearings at each end of the moter shaft. I have beaten the daylights out of it, but is still works just fine. If I ever do wear it out, I'll buy a Sullivan