I have a nice custom percussion fullstock rifle I bought from Oregon a year ago. When I got it, hickory ramrod would withdraw from stock perfectly, not tight, not loose. Today, after a year in humid Louisiana, rod is stuck tight as a drum in the stock. I have pulled on the brass end with pliers, still won't budge. Guess the rod swelled up in the stock. Assuming I can get it loose someday, how to prevent again? Sand it down more, coat it with something, or ???