I covered this a day or two ago but I've been reading all of the archived material as quickly as time allows and several fixes have been mentioned, self tapping screws, wedges, little screws and nuts, etc. That aint it folks! It's not a problem of things getting loose due to vibration, It's oxidization, air gets in there and pretty soon no actual metal to metal contact. The other fixes would work for a long time, if you drilled out the rivets, did a good cleanup job, and then put the shims, screws, etc., back. Other than that, there are only two long term fixes, either solder or replacement. Do it right, you'll be happier.