'Otter'. Build log.

[Blazing Black Beard]

Unless you are using very fancy pulleys with D-shaped holes, then the flat is only for a grub screw to bear against. It's not critical and you could always put a flat on with file (if soft enough) or small grinding point. That's what I did with the ends of my ballscrews which did not have a flat as supplied.

Ah well I'm worrying for nothing then. I'll keep these on the shelf until the physical build is done. Still waiting for the steel to arrive, then hopefully I will have some idea what I'm doing with it.

With the top of the steel box section being the bed for my linear rails, would skimming a very tiny amount (possibly 0.1 mm or less) from them with an end mill give a flat enough surface to mount on so the epoxy can be skipped altogether?