If the endpin socket is cork lined, it may have swelled a bit which would make it tighter. Usually the cork wears or compresses a bit over time. I would be hesitant to do anything to the cork if that is the problem since it might lead to a bigger problem later. I had one on my own bass that started to rattle after years of use when the cork had worn to the point where the endpin rod was loose in the socket.
That's the only thing I can think of. Perhaps Arnold, Jeff or one of the other luthiers will joint in on this one. I'm out of ideas.
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95% Retired Midwestern Luthier
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