Get A.H.Fox in very good original condition and the problem will go away. A lot less expensive in lower grades to boot.
The only thing I don't like about my "Fox" is that kluuuunk sound when I close it.
Are you ever going to be confident about using this Winchester w/o diagnosing the problem and fixing it? I wouldn't be.
Model 21 with problem(s) = BIG money pit.