When I initially took my bolt apart using a large allen wrench, I removed the bolt from the receiver, wrapped it in a shop rag and placed it on the floor with the wrench in the bolt screw. I stepped on the wrench with my full weight before it finally broke loose with a loud crack! I thought I broke something it was so tight. After replacing the factory bolt handle, I used the same procedure to tighten the screw (but didn't put my full weight on the wrench).
I would recommend removing it from the receiver when tightening/loosening. I don't believe you can over tighten it to make the bolt stiff. Recheck everything in the assembly to insure all is correctly installed/lubed. Does the bolt operate as it should and fire a cartridge? Shooting while loose may not pose a danger because the bolt lugs contain the forces in the chamber but, you may end up with misfires due to light primer strike.
All my bolts are a bit stiff upon opening as they have not had Fred at Sharp Shooters magic worked on the action/bolt.
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