I may have re-invented the wheel but wanted to share some tips. At first I had a heck of a time trying to get DD used to the Dremel. He outsmarted me several times by pulling away his foot during treats when the Dremel came even close.
In the meantime he does "down" on command on the grooming counter (I can still lift the chunky guy). I take a handful treats, DD lies down and as soon as the (running) Dremel touches a nail he gets a treat. He is becoming pretty tolerant, without having to be held.