This is a disturbing thread for me.
I've always assumed that the bubbles were level on the sights I bougt. I have 2 Twilight Hunters, 2 CJ Dead Nuts II's and 2 HHA OL 5010's.
None of them have 3rd axis.
I've always just put a level in the sight window to check the bubble on the sight. Is this not enough?????? I also have put a level against the sight mounting bar to check it.
Sometimes it seems I have to kick the bow over to the right to get the bubble level.