I use a impact gun, I have a corded Dewalt Hammer drill 1/2" chuck that couldn't cut it . Here is my picture of my set up for the shaft end. If you take yours apart I would suggest putting in a " GOOD " thrust bearing . Most lifts I have seen have the screw mechanism made in China and if that is the case the clearances are wrong and the T-bearing is cheap and and wont last long. That's how mine was. Just a thought.