butchlambert
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Apologies, I've been away for most of the weekend and didn't realize that my question would generate such a discussion.
In the end, I think it is a more mundane reason for the bolt not closing - the bolt body is slightly oversized, perhaps by 0.0015 and is binding when I am attempting to close it. The measurements (lug to handle) show that the bolt should fit. So now I think I need to polish down the diameter til it fits.
OK, good to know. I think a different issue than has been addressed.