The restrictive nature of the vacuum check valves should limit the vacuum enough to pose no threat to any bearing, I think. But the metal shielding is a bit less waterproof, I'd say. Condensation may pose a threat to a metal shielded bearing. I suppose I will have to look a bit harder. Will probably be derailed by Valentine's Day, though. Such an inconvenient holiday.

Still drafting up a degree wheel in CAD, despite a toddler bumping my elbow at every opportunity. I noticed the slightly abnormal shape of the wheel, but I do wonder if it was pressed up flat against the scanner with a weighted object. Still, it is very useful for indexing the design properly. Thanks again. I have not superimposed one onto another yet to check for differences. And yes, I will take any scan I can get! I believe these are made by heavy chemical etching, not laser cut, as some may believe. Kind of like when etching a PC board, but with stainless steel as the material.