Earl has a very good point. If you are going to do it that plastic tipped punch Dawson sends will not take a sight off. It is for putting a fitted sight back on without damaging it, the solid aluminum punch he sends out for the rear sight works well for this. It takes a good solid punch with something on it to keep from marring your old sight or transferring brass or aluminum to the sight when you are knocking it off. Using cloth to pad the vise is not a good idea either as you found out today. Leather works well but be careful not to over tighten the vise, you don't want to bend anything. Once you get it vised up in leather you should be able to tap the sight right off. If you are intent on doing yourself just be careful and it should tap off fairly easy, if that fails a gunsmith is cheap for this job even if you have to send it out to get it done.