I made mine from and old cooler fan motor,110 then wired in a adapter to cut it to 12 volt and wired it through a car headlight switch,the part that controls the dimming of the dash lights.That
way I can speed it up or slow it down when ever I want.Sound like a bunch of Banjo work but it really wasn't much to it. Works great.I mounted it on a board with a rubber gas line hose for the nock end and a v block for the other end to set in.I like making stuff from scrap I have laying
around.
Pappy