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Figured I would share this for people to understand the options available to them.

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The holder sizes are recommendations - it tends to be a bit stricter on the triples than the quads, but now that they have 6 instead of 3, it can be finely tuned a bit better. The 50mm glide profile that you tried (Hudson V) is a custom profile that No-Icing created. The graphic above are Prosharp's stock profiles.

I think 2 to 3 clicks on the Alignment Adjustment is .001", as per Sparx documentation here: https://cdn.shopify.com/s/files/1/0932/7770/files/Sparx_EdgeChecker_Instruction.pdf?8101190776335265406. That means 1 click is in the range of .0004"-.0005". How fine then is very fine? I've got the home unit, not the commercial one, but I used my edge checker to dial in my alignment so it's dead center consistently on the Step and Bauer steel I'm sharpening. I did find that polished CCM steel throws the edge checker off - my alignment was still fine, but the sidewall inconsistency of the polished CCM steel throws the checker off. As far as I know, Sparx has only one edge checker, and it's one of the nicer edge checkers on the market that I've seen. If there's a knock on it, maybe it's that it's over-built and more expensive than it needs to be. You described it as "The edge checker is crap. The lines are very far apart, and the general construction is not good." - are we talking about the same checker? colins