About a yr ago I changed the chuck on my Delta drill press to an Albrecht. It accepts bits 1/32 to 1/2. Up until now I've love the upgrade. HOWEVER, today it started simply dropping off the machine. I've replaced it several times, gaving it a couple good whacks with a piece of wood between it and a hammer. As soon as the bit gets tight in a hole, off it comes again. Any suggestions? TIA, Vince