I used an angle grinder and a dremel to deck and cut a new squish on a treats hi comp head yesterday. proof a little creativity can get the job done. The decking was done nearly the same as cutting the squish. the angle grinder was held in the vice and the head was moved around under the wheel. 120, 220, 320, and 400 grit wet sanding was used to hone it in. Took a little over 1.5mm off the head.
The end result was a huge low end gain. No head leaks at all and no gasket, gasketmaker or spray or anything. just aluminum on aluminum. after the carbide cut, it was grinded and then sanded with 220, 320 and 400 grit.
here's how i cut the squish. the dremel is in the vice and the head rotates on the plug
i forgot to take a final picture before i threw it back on the ped. I'll grab one soon