The diameter the cam bearing is riding on is slightly eccentric to the spindles locator diameter that fits into the pilot diameter on the engine housing.
CJ had once mentioned about this article written by RE Guru Nandan on cam-gear backlash and adjustable (eccentric) spindles found at this link -http://cybersteering.com/cruise/feature/bullet/camgear.html
So my recommendation is to not worry about trying to eliminate normal running noises.
even thought the .50 cal is a bit louder..
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