Plugging Di2 holes on my frame that aren't used anymore, anything more elegant than a carefully cut bit of electrical tape?
Assuming the holes are round - rubber grommets
https://www.ebay.co.uk/itm/200Pcs-Rubber-Grommets-Blanking-open-closed-blind-Grommet-Set-in-Assorted-Sizes/303876502101?
Shimano do specific grommets for this. What size do you need as I have some spare, would happily post over.
@onyerbike started
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Plugging Di2 holes on my frame that aren't used anymore, anything more elegant than a carefully cut bit of electrical tape?