I most likely have the terminology wrong, but the guide a chain follows on the bar. I read using the straight edge, but I'm a machinist, and I measure stuff 
A chain (or this case my chain) is .050 nominal, what is the measurement for a worn guide? I searched but not finding, it, just the ruler trick. .055? or whatever.
A chain (or this case my chain) is .050 nominal, what is the measurement for a worn guide? I searched but not finding, it, just the ruler trick. .055? or whatever.