Will be splitting cases in next couple of days to extract a broken or chipped gear. This was the cause of my noisy motor ( swishing noise ) The piston / rings are garbage pail liner. Luckily the 420 rebore I had done over the winter was so tough that there is no major damage. Will have that shop pass stones to remove minor glaze. Asides from the obvious ( such as being organized and calm / patient ) is there anything in particulat to look out for?