I have an older 870TB that I bought, and I have shot for a while. I got to noticing that I would hear a “clunking” noise every now and then. I finally found out that it was coming from the stock area. I took the butt pad off and found that the adjustable Edward’s Recoil Reduction System had been installed some years back. Apparently it had loosened up some in the stock. Long story short, is there a way to tighten back up the recoil reducer in the stock? Thanks in advance.