Hi guys, I recently picked up via the internet a No1 MkVI that had been fitted with a BSA No4 bolt matched to its A suffix serial number. I'm pleased with the rifle, but I'm not sure how the seller managed to get the bolt into the gun. The bolt head stops screwing in a couple degrees off from where it should unless you force it, then it just barely lines up. I've tried several of my spare bolt heads with the bolt body as well and they all do the same.

Obviously, I'd rather not change out the bolt body, as it is fitted to the rifle, but I'm at a loss as to how to solve this problem. I've attached a couple photos as well.
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