Hi, I am a newbie here. I have had a T3 for many years and have found it absolutely essential for chisels, planes, planer knives and also domestic cooking knives for my partner, family and friends. As a result my stone has worn down such that when i grind longer knives it now clashes with the honing wheel. So I am now wondering is it time to replace the wheel? I am asking because the cost at £75 is a lot although i know i have had excellent value from that old stone! Any thoughts?