I had this installed in about a half hour on my j head Bridgeport. I needed to file the key way on the brass gear slightly so the woodruff key would fit.My machine previously had the same "style" powerfeed on it when my buddy owned it. He removed it for his new machine.The instructions are horrible, but if you own a milling machine you should be able to install this without too much trouble. I'll update my review after 6 months. Just installed it today (1/31/22)