The Ithica uses a 20tpi thread. Anything else isn't going to work. If you're saying that the barrel almost turns in all the way but won't more than likely the shank dimension is a slightly larger than the original either in diameter or length. If the barrel was made for the 37 then I would contact the maker and see about exchanging it. If it's not made for the 37 then I'd get one that is. George
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