I have a series of ornaments ordered that require finials so I thought it was time to invest in a collet chuck. I got the Beall with a 3/8 collet and am struggling with it. It seems to either want to spit the finial out or it breaks off the tenon. I have been very careful in sizing the tenon and leaving a nice square shoulder, but it just doesn't seem to work. Am I missing something? Any helpful advice would be greatly appreciated.