Hi Gadge,
A few years ago I was rebuilding a 1948 350 Enfield motor and somebody had fitted a Toyota piston to it, was all good till they tried to rotate the crank and the piston skirt came down and hit the crank. Believe it or not, instead of removing the piston to shorten it they cut the skirts back on each side with a hacksaw insitu. How did I know they used a hacksaw, the cuts were how it ended up cutting and I could see the teeth marks and I would say it was an 18 tpi blade. The motor was running because we went on several club rides before it gave up the ghost. Moral of the story is sometimes you can get away with murder regarding pistons