Has anyone ever had to adjust the collet on a Foredom Quick release hand piece. I have read instructions both on the Foredom site and the paper that came with it and haven't been able to get it to adjust tighter. If you give a burr a bit of a tug, it comes out. Surely this shouldn't happen, for one it could be dangerous if one came out while it was working. I would just be interested if anyone has the same problem and how to solve it.