I have an older Skil Model 2892 18 Volt Cordless drill/driver. Not the new red ones but an older grey one. Plastic housing. Two speed selector. The motor runs but the chuck won't turn. How do I get the chuck off and proceed with repair? I suspect the clutch is broken. Or ? If I could get it apart I could see whats broken. I looked inside the chuch and don't see any screw. I also noticed that parts are limited supply. Thanks, Gerry