I'm sorry but instead of a Dremel just get the Black & Decker rotary tool. They take all the same bits, variable speed and instead of that stupid button for locking the armature it has a fool proof lever. Also, it's quite a bit cheaper. I used Dremels for years (I'm 82) but once I got my hands on the B&D, I have never been tempted to go back to the Dremel.

The only Dremel I keep is the one I have the right angle drive attached to.