Sounds like grinder work to me. All in all since the grinding wheel is flat it's not all that hard to control keeping the surface flat. Finish it off with a file maybe 20 min. per sidebut I've been working on it for about 8 hours total, and I don't even have one side cut off yet,
While I don't actually recommend it (unless you are used to using it) I use a 4-1/2 inch hand grinder and finish off with a 10 or 12 inch bastard file. A flat surface and tolerance of 0.01 mm overall can be obtained with cross trace filing but don't be in a hurry. Actually I don't come close to that when grinding the tanks off the U33C frames when building the C630M's
Willis
I was wondering that myself.Thanks Grande Guy (think about it, do we got Grande Twins here?)