Well the cheap rotary tool I wanted to rob the chuck from is a no go. Cheap soft aluminum is what it was made out of and trying to remove it got chewed up. So now I’m thinking to make my own. When you think about it the unit is nothing more then a shaft with threads on the outer and a nut on the other end that compress the collet. The collets I have from the cheap tool are brass and will work nicely. I just need to find a piece of solid round stock and attempt to drill it out with out a lathe. If anything I’ll just buy the Dremel chuck (Part number 4486).