Quote:
Originally Posted by MRX37
I found a steel bolt that is of the same diameter and threading as the slug. I put it in and it seems to work fine.
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If it seems to work, why not.

It may be a bit lossy, but if the set appears to converge fine, then I'd leave it, unless you have a huge piece of it sticking out, flapping around enough that you think it might bust the coil off the board.
Most any ferrite core with the right threads will probably work. Old IF transformer coils and such stolen from something in your "junk box" (we all accumulate a fair amount of scrap electronics we keep around just for reasons like this).