Pulled out of storage a sissy bar to re-do cosmetically, for re-sale. The pad has 4 machine screws going into nut-serts in the pad backing, which is inside the fully-upholstered pad. Three of the four pad mounting screws were able to be removed, the fourth, is like a compact Chevrolet of the 1960's: "No-va" as they say in the Spanish-speaking community. It took awhile and I broke bits, but I was finally able to use my floor-model 17" drill press to drill-out the frozen machine screw, and then chase the threads (I chased all the threads on the four nut-serts).
The pad upholstery needs to be replaced, but the OEM one will serve as a pattern. The reinforcing plate will be re-used.
I used an air tool and a wire disc to remove the barnacles from the three major pieces. The loop of the sissy bar needs to go to the plater's to have the crummy chrome removed. I'm not going to re-chrome it, it's probably going to be powder-coated in a matte silver.
I did get to use my portable bandsaw to trim the loop to make it fit tighter in the two side bracket/handholds that it bolts-to. I started out with a cut-off disc in a side grinder, but the tool isn't a good one, and after four stops to re-tighten the shaft disc threaded nut, I tried a hacksaw, but then I grabbed my Porter-Cable portable electric bandsaw, w/a bi-metal blade. That was quickest, I should have used that to begin. Ah, it's done.