super hyper duper easy
[1] remove the pad by rolling it underthumb
[2] put a cloth on the glue left
[3] imbibate with a solvent (I use "Solvent F"). never use acetone, it creates micro cracks in the resin, and cover with a plastic sheet
[4] let the solvent marinate 15mn
[5] remove cloth, and scrape the glue with an (old) credit card, the glue cames off as easy as a butter layer
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