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I ordered this from Condor as I need the hidden bolt for my Athena 11speed cranks. The parcel will arrive tomorrow, I can measure the washer with my digital vernier and give you its dimensions? I presume the washer is of equal dimensions as between Athena and Centaur as the product description on the Condor page states that it is a "Genuine set of 5 chainring bolts for 5-arm Campagnolo chainsets with a hidden bolt."
I have also bought Campag spares from https://thecycleclinic.co.uk/ in the past, they might help. This page looks useful: https://thecycleclinic.co.uk/collections/bolts-and-screws. And maybe this is the part you need - https://thecycleclinic.co.uk/collections/bolts-and-screws/products/campagnolo-10-speed-chainring-spacer-fc-re006 ?
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superbagneres
@motman
I recently stripped down an old (2011) Centaur crankset, cleaned it all up and re built it. When I torqued up the chain ring bolts I noticed the inner ring wasn't quite parallel to the big ring. It looks like I might be missing a spacer in between the chainrings and the hidden bolt that goes into the crank arm. Thing is I don't remember it being there when I stripped it down but I guess its possible it fell out without me noticing. This is what the hidden bolt looks like (FC-RE302), the spacer needs to be 4mm thick I think. I can't seem to find one online anywhere so hoping someone might have one or know somewhere where I could get a replacement.
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