I am not in favor of a grading system. Both buyers and sellers know what they are buying or selling and should make their decisions based on their knowledge. What some may consider used, someonelse may consider worn.

Having said that, if there is to be a grading system, I think is should be as simple as possible. What you have proposed may do the trick. I think a seminar at the show in July would be an appropriate place.

Just my 2 chips worth.

Mike