Hi Norm,
Any chance you could clarify what you mean when you say you can't hone to +20? Accordging to AVB you can and he says he's done it before. A quick search online and youtube has come back with a very simple tool for doing this on minor scratches and so fourth.
I'm assuming you mean that the oversize piston that is available is too large to hone and using such a tool would be near on impossible to increase to +20 perfectly without imperfections and such in the bore?
Would another option be to hone the bore, reuse the same piston and clean the scratches up on the piston and try get some new rings to suit?
