Hi, I inherited a Rockler router table with a Craftsman router mounted underneath. I'm having trouble with the split shaft collet and the bits. Even when I loosen the nut completely off, I still cannot remove the bit. And when I eventually pull hard enough, the bit and collet both come off with it. I'm kind of a router newbie so I may be missing something. The one time I got everything set and started routing, the bit popped out! Any advice would be appreciated - thanks