[Darren Collins]

Thank you for all of the insightful responses. I will take a closer look at the hex stock we are using and check for uniformity and straightness.

I looked at the designs on our gearboxes and found that the center to center spacing only had an additional +0.001". We will begin using +0.003".

I'll also purchase a higher quality hex collet and ensure that our workpiece length is minimized.