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I am fixing up an old Castelluccia which needs a few little repairs. It has the original yellow button Delaruelle tuners which seem to work ok except one has lost the plastic button. Luckily I have some old spares I kept just for such an opportunity but the question is does anyone know how to remove one of the buttons from a scrap set and then fit to the usable one, were they glued on? I am obviously reluctant to use any excessive force, it will just break, but I wondered if there is a known 'trick of the trade'; y'know like submersing in near-boiling water, or leaving it in the freezer overnight?