I think that your problem is related to the date that Ithica started making thier barrels interchangable. There is a difference in the dimensions of the barrel threads previous to a certain serial number, the newer ones interchange freely and the older ones need fitting. I don't know what the fitting entails. I think the time frame of the changeover was in the mid 1950s, but you'd be well advised to check that out with someone who really KNOWS for sure.
Don in Ohio
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