Chainsaw Repair

One of the viewers asked a question about clearance between the transfer caps and the cases when either cutting the cylinder bases or building w/o base gasket. On mine, the flywheel side rear most corner of the transfer cap just about hits the cases. I can just get a "leaf" from a feeler gage through. On another set of cases I have it actually appears there is a wear spot EVEN though it had a base gasket therefore would need to be relieved. Is this typical? And since this would most likely effect how the transfers case to cylinder intersect... is this a potential problem and a possible reason why some are lean???