George, touch mine up every time I go out or at least try too! Usually with a diamand rod or ceramic. I don't use the marker much now, but the gentleman asked, and it worked for me. Yes the pass thru may not matter , but what about the marginal ,no pass thrus?
What really bothers me is the folks who don't touch up, and leave them in the foam hoods, thinking there protected. I know people kill deer every year this way.
Just remember, when you shoot that arrow, be sure it is sharp, everytime! Good shootin, Steve