Yeah. I figured that on this scale, perfection isn't really necessary. I have no robot to mount a drum onto/into, but just for the hell of it I might see what I can do tomorrow. I've got some 20mm chopping board which just screams use me. Using 3 bolts actually makes perfect sense, Jamie. That's the kind of thing that wouldn't have occurred to me! Also, the reason I didn't just think I could use bolts that go in a little less than halfway is because I'm not sure how much I'd trust the plastic to hold a thread (keep the bolt tight) and to not catastrophically fail at high speed.

I guess I'll find out one way or another! :wink:

Thanks again.