JR Boucicaut

Witness marks are good if you're doing the skate over and over again. For the home guys who are just sharpening their own skates, you can pretty much sharpen away because they are your skates. Unlevel sharpenings will throw off your witness marks anyway. I mostly sharpen LS2s and PITCHs - I know from memory that I have to adjust down for PITCH because it's a bit thicker than LS2.

The smaller the wheel, the more you have to dress it to get a proper shape on the wheel, thus killing the life out of your Spinners. It's cheaper to buy a new wheel than a new Spinner.

Ok...you're still over-thinking it. The pitch knob has to be there because of the type of holder and the way it adjusts. They have it set at a certain height from factory because it takes the center of the grinding wheel into account. Blackstone will give you that measurement if you need it. The old style lever style holder has a floating plate that moves up and down when you move the levers, therefore no need for a pitch adjustment. However, on the newer holders, that "plate" is fixed. But yes, you answered your own question in your last post. Having spinners dressing the wheel pretty much ensures that each dress will be true. It's up to you if you want to do the math...