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At 4 quid its worth a pop... cheers. Weird thing is the diagram states the same seal is in the top set but there's nothing there either and that's all fine.
Jw89-
I think my modern record headset has them both but I got it a while ago so can't confirm. I'm sure it's just to keep dirt and a bit of water out but if you maintain it regularly it should be ok.
Edit: If you have to pay postage for the 1 anyways, if you can stretch to it, you may aswell get the top one too. Edit 2 (if it is a chorus HS)
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I just checked my record and it has a crown race that covers the whole bearings so I can't see if it has the bottom seal.
Does the cup have anything to tell what headset it is?
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I'm also missing the same seal, but on a 90s Athena headset.
Which headset is yours exactly? I'd be interested to know if that part works.
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That Record above may or may not fit, this is the intended seal for your headset.
https://www.merciancycles.co.uk/online-shop/campagnolo-seat-pin-headset/hs-at005/
3c70
Ndeipi
gertrudestein
https://thecycleclinic.co.uk/products/campagnolo-record-threaded-headset-spares
Spares here for 4 quid assuming it's the correct headset