[Ron Ramirez]

^^ What Arran said. The sleeve is held onto the electrolytic with tar, sometimes on top, sometimes on one side.

I used a heat gun to remove the cardboard sleeve on my 53-960 and did not scorch it. I had a second 53-960 parts chassis so I also removed the sleeve from the electrolytic on the parts chassis, cut the bodies of the electrolytics off leaving only the bases, drilled holes in the bases for the new electrolytics and installed them. When finished, I used the sleeves to cover up both, leaving an original appearance. Reference post #5 in the link I posted above.