RB,
If you are saying the threads in the black RA clutch? knob are not round and the polar scope opening is also not round this is not likely because you probably could not use the knob to adjust the clutch pressure. So I think you are talking about the actual opening bored through the DEC axis axle shaft which is exposed when the caps are removed.?If you use a caliper or steel rule I think you might find the opening in the DEC axle is probably not egg shaped but round, this is probably a illusion given by the hole having been bored perpendicularly across a round axle shaft. Additionally the opening in the DEC axle is not intended for the polar scope to physically pass through but allows the polar scope optics an unobstructed view on the RA axis of the mount for polar alignment on the NCP. I hope this helps.
Chip??
