Its still temporary. Eventually the rubber will lose its form and melt all over the place, throwing a tarry mess all over the drive, thus destroying it. The only, and i mean ONLY fix is to remove it all. and replace it with a new one, or a make-shift one from an old cassette/reel to reel tape pinch roller (which is what I did). Or use a super small o-ring if they make one. 

Oh, and the newer drives have the rubber bumper UNDER the platter itself. Fun to get to. I only did 1 drive that way, and I removed the platter and head stack assembly to get to it. Nightmare. But this technique works easily with single platter drives. 

Multi-platter drives require a special removal tool so they dont slip and cause cylinder mis-alignment.