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Some hardware stores stock equivalent grommets...If you wish you can buy one unsolder the lead and thread it through the new one then resolder.
Those burn holes on the bottom: best to drill them out till there is no black (conductive carbon tracking) left, then fill the hole with RTV silicone. (you can buy a small tube that does not require a caulk gun at an auto parts store.) Make sure the patch is flush with the underside bottom of the cup so it will mount properly to the chassis. It does not matter if the patch domes up inside the cup. Let the silicone cure before applying power again.
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