I recently got an Efco grinder (similar to the oregon 511). I have the basics down and have done a few chains with good results. Any good tips you long time grinder users can give to us newbies? What's the goal with a dressing stone? Since this grinder only "cuts" from one side of the wheel, should I flip the wheel over in the grinder after X number of chains to cut from the other side so it wears evenly? Thanks guys.