Looking to purchase a self-releasing tapping chuck for my Hardinge HC. I know about the Hardinge TT (5/8")and was looking at them used on ebay. Prices range between $275-$375 used depending on the number of collets included. I also thought about a Tapmatic part # 023262 which uses rubber flex collets (not even sure how many are used to cover it's range). That item is about $300 new. Are there other options I don't know about? I would like to have the larger tap capacity of the Hardinge TT. Thanks!