OK I know the write-up is for the entire setup, but what got me interested in this build is the use of the drill motor (old cordless drill). This is nice since its geared, the author reverses the chuck so you have a reverse safety release built in, oh and easier to couple with the motor too. And …it works and is cheap. This is the way to go if you can’t afford, or don’t have a bike based solution.
Oh I like the homemade bearings for the shaft too.