The disassembly of the door stops is fairly straightforward. I'll include some pictures to show the disassembly.
Mount the door stop in a mar-free vise. Use a large flat screwdriver in a twisting movement unlatch it from the catch. Once you've gotten that part loose, go ahead and use a brass bar/ wooden stick and tap it off. Once separated, you'll find they come apart and you'll be able to clean it easier and service the roller. The one in the picture was pretty gunked up. I oiled it and took it over to the wire wheel. When you reassemble just slide the pieces back together and attempt to clamp it. You'll only be able to go so far because there is a hump it needs to slide over. I found the vise very handy to accomplish this. H
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this helps.
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