What a drag! I can speak from experience, because the same thing recently happen to me. I purchased a used board described to be in “good condition”, and by the pictures it looked fine. However, when I opened up the package, the board was well used with thin edges and one of the inserts was cross threaded and partially striped out.
The thin edges, scratches, nicks and bruises I could live with, so I took to board to a local machine shop where they were able to re-tap the insert. After several days of hard ridding and checking the threads after each session, it looks like the problem is solved.:)
Sounds like bschurman knows what he's talking about, he may even be a nuts and bolts guy--- check out his avatar. Hope your able to get it fixed. Happy carves. GJC