I just cleaned all four of these. The 18's were in pretty good shape and the 10 were gummed up. I replaced the springs in the 18's and they are all working like new. As you can see, they have hardly been used and therefore they still grip/hold the sheet as good as a new one. As an added bonus, I am throwing in the riser pads for the 18's. email me at firstname.lastname@example.org Asking $500 for the set including the risers.