Got a question. I am looking to buy a new chuck and I am thinking Vicmarc. My question may be dumb but I am confused. I know about the 5" VM120 vicmarc chuck and have heard great things about it. This is the one i as going to order then my craftsupply catalog came along an they show a 5 1/2" vicmarc chuck. Only model number listed is the craftsupply item number. What is the diffrence beside the obvious 1/2"? The concern is that the 5 1/2" seems to be a newer model but they list less jaw options for it. Does anyone know if the 5" jaws will fit the 5 1/2" chuck and what, if any, is the diffrence in the chucks? HELP!!!