I've wondered what these were and how it is geared or whatever to get speed both ways? Is the head bulky then? Gears both sides? Anyway, Chieffan, I have one of those vibratory cut-off type tools. That might also work for your floor trimming. Lots of odd shaped blades for those. ONly used mine a few times, but really does work pretty good. Odd how they just vibrate back/forth but does cut. Have used the plunge cutter even to cut off wood trim by doors to make flooring fit under it. Didn't think it would work, but cut like butter. Odd tool. Think mine is HF too. I go to a weld shop that has tried many brands of tools for the small grinders. They have a barrel full of the old burnt out ones. They buy, use it up, burns out, throw in barrel! Buy another. I saw many brands in there, name brands and chinese, they are all about same they say. Not sure what they do with them all when barrel is full. Scrap yard??