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...you have two half round rubber parts that are attached to the bottom of each bag and they sit on top of the round tube support under the bags...
Not long after I bought my FLHX I found a rubber thing laying on the garage floor -- obviously went to something but I was stumped. So I threw it on the workbench and forgot about it.
About this same time my left saddlebag started vibrating and rattling like crazy. I tried taking it off, putting it on, adjusting the mounts, etc. All to no avail.
And when I finally looked at the bottom of the bag, and saw ONE rubber mounting pad and one missing, I said to my genius self, "Oh."
I'm new to this. I pulled my seat off and had my buddy showing how to do my own maintenance and tricks. I went to bolt the bracket back on that holds the passenger strap and bag pin. He told me do not tighten it and to put the bag on, secure the pins then tighten the bolt for the bracket. he said this way you get correct placement. Made sense to me. I have had the bag off several times since and still tight. Maybe this lil info may help.
I tried this and problem has been solved. No more bag jumping all over. Thanks to all who replied. Jim
Just ditch the passenger strap altogeather, and I also put in 5/16 " hex head bolts with a fiber lock nut just snug enough to rotate a little. Keeps your bags from comming off accidently or someone wanting a set of bags.