I pulled my Prodrive LPS 40meg apart that went into the classic.

the rubber bumpers sit on the magnet posts that the screws go through. I had to remove the head actuator assembly to get at it, as its in a really tight spot. lol, I cleaned out the old rubber little by little and still couldnt get it all. Maybe some acetone I could.

after that, I stuck some plastic foam in there and presto. works like a brand new drive.