Well had a few min spare to put the head on the barrel & measure squish. 1mm at the cylinder wall & 1.1ish at the chamber which is pretty much exactly where I wanted to be & its the same the back as the front which is an improvement over stock.
Here it now waits forlornly in my Sheldon c/w old style tool holder for everyone to laugh at, but it still works fine for this sort of stuff. The hand cut head tool is pretty small as I made it for doing heads of 40-50mm dia. A bigger one would be easier but my tool holder ain't that big. I'll just take a few cuts and work carefully with blending radius's.
I had a quick play with some old TSR sw & calculated the head currently in the 40s which with a suggestion to stay within 15-25m/s range is pretty high, so first thing I'll do is take off the inner anodised section which should take my squished area from 56% down to 50 & lower that substantially.
I'll need to remove a fair bit of material but I'll do it in a few steps & measure cause even though that is tedious, its easier than putting material back in.
I've taken the head stays off to slot them a bit more than std to account for about 2mm of movement down.
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