Okay, so I am slow. Took me over 30 years to learn this. In the past, when my wedges got too mushroomed (way past where they should have been) I would pay a shop to grind them down. Was working on my wood pile the other day and decided to try a disc grinder. Shopped around a couple pawn shops - too high $37 was cheapest. Found a B&D 4 1/2" at Wall Mart for $25.
Was totally amazed at how fast that homeowner special cleaned them up. Why didn't I buy one years ago!?