So a while back my bass cab developed a nasty buzzing/farty sort of noise. I discovered three of the screws that held the speaker in were stripped. I replaced those three with t-nuts and machine screws and all was well for months. Until this week. The noise started again. I decided it was time to replace all the screws. I started to take the speaker out and discovered that all three of the t-nuts I had previously replaced had vibrated loose. They were no longer stuck in the wood. They had come loose and were just vibrating their way off the machine screws. I hammered those suckers in pretty good when I put them in. How did this happen? Do you guys glue in your T-Nuts or something? What am I doing wrong?