use someone who knows what they are doing, for example, I have always been very pleased with Piston Broke engineering in Bristol. The chap there knows more than you could ever imagine. I once asked him to bore out an Indian Scout 741to fit Indian Chief pistons and he did the job using the original liners. It took days to take out all the metal but it worked a treat. The man is a genius.
He also did the rebore on my 500/4 back in 1995. He suggested I run in very very carefully as he rebored it very tightly. He considered it a waste to go out to the sloppy tolerences that a lot of people use. He was spot on; nearly twenty years on it still doesn't burn a drop of oil.