Ok, here's a stupid question for all the experts. So far I've only used one chain, it was the chain on the saw when I bought the saw, and the sharpener that came with the saw was pre-set (I assume) for that chain. I sorta took it for granted up until now. Going to be switching chains here shortly, and I have absolutely no clue how to know if my sharpener is set up correctly? Its the oregon model, with three individual angle adjustments. Thanks for helping a relative chainsaw n00b!