73 /6 PS: Correct way to purge air from box?

RGAZ said

I believe so. I mean it moves so very little that its hard to tell, but I kept tapping away at it and it doesn't move or change anymore.

Next step?

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I would make 100% sure. Did you try loosening the bolts just a little more? Once you determine you are out of adjustment, I would be perhaps looking at a replacement gear box.