Issue with 120VAC is you lose any easy speed control methods. But, our baseline OFNA doesn't have speed control either.

I'd love to be able to set a couple of preset depths (front/rear, grey/black carpet).

I think the arbor issue has been solved, hasn't it? I saw three-prong arbors at IIC.

I've got an idea for how to do the more accurate size indication, when we get to that point.

What's the best bit? CRC?

Thanks!
Robert