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sorry I don't know about your digital piano because I never repaired it.
thanks for nice comment, and IF you detach all the keys and put them into hot water to let the glue melt on itself and clean the weights, after that (for reassembling) you can use any Polychloroprene Adhesive for the weights to stick back, I am not sure about the toxicity of the glue but I use gloves, glasses and be a lot more careful while using these kind of adhesives, and wash my hands, you can ask some carpenter or technician or better a doctor about the toxic effects before using it, I hope it helps.
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