Zeroing the camber settings on SE-77

[Dakotapix]

I was regrinding an old Stanley blade for a vintage no. 5 plane and noticed that it seemed to be grinding a bit off the 90 degree angle. Did not want camber on this blade. I made the correction by tapping the blade so the high side would be ground down. It worked out fine but I wonder if the two camber knob settings might have been skewed one way to cause the uneven grind. I tried to zero those settings by eyeballing but I wonder if there might be a more precise way of doing this. I see no marks on the jig to help with zeroing.

Am I missing something?

[Dakotapix]

Yes, I was missing something. I went over to the main site and read the SE-77 instructions and found I could have made the adjustment to the non-square grind by turning one of those knobs. I think I've answered my own question.