Do you have a link or anything to show or describe what you're talking about? I just did a google search and found absolutely nothing of what you're talking about.
the bubble jig works so good i was able to start freehand grinding 2 months after i started using it. with the normal knife jigs, you will be stuck using them, they dont train you like the bubble jig.
Fred Rowe is the creator and mfg. of the bubble jig, and the ERU a pull through knife sharpener that runs counter to the typical negative thoughts about that type of sharpener--it is a well functioning precision piece of gear!
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