Joe, I burned up a Dremel milling down the weight in an Atlas geep to make room for a speaker enclosure (no prob, I already had another newer one). Then I read somewhere that Dremel motors were never designed for that type of metal work, a lathe or drill press is the best way to go. I never knew there was a problem with the drive, since I had dismantled my layout shortly after I got it.
Karl - no hint intended, just a wistful remark (think Wizard of Oz, "If I only had a ______.")
Gonna be warm here again today - always 5-10* above what the dart throwers predict!