As jw suggested, I attempted to remove the collets, had a 1/4" in the router, but neither one would come out w/o some persuasion. I tried just the 1/2" collet with a bit, but the same problem presented itself-the collet would not release the bit. Also, the collet nut loosens, but does not have a place where it feels tight, thereby loosening the bit when turning more. Before buying replacement parts, I blew the collet housing and collets off good, but with no luck. Sooooooooo.....I guess I will bite the bit (no pun intended) and order parts. Thanks for your reply.