I bought a AIT model 1001 speede blocker, it came with a semi-tech chuck adapter. I've purchased 5 different AIT chuck adapters but none of them fit my 1001! They all only fit my 630. None of these have screw holes on the back to attach to my 1001 they only have screw holes on the side (how my 630 attaches). However after 5 different people have sent me the wrong chuck i'm starting to think I'm doing something wrong. I see no possible way this could attach and even the centering hole doesn't fit. If anyone has a 1001, your AIT chuck adapter does have 3 holes on the back right? 1 for centering and 2 for screws?