Purchase the Round 2.5 mm Diamond Burr for Algerbrush (with Chuck) from Gulden. This extra large burr has a diamond grit for longevity. Comes with chuck.
Use a flathead screwdriver or a pair of pliers to remove your old chuck. The new chuck can be installed simply by pushing it into the handle. You can sterilize this chuck in the autoclave. Do NOT sterilize the Algerbrush handle in the autoclave.