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I'd really appreciate you sending me an email (my address is in profile) so I can ask a couple of questions - I'm struggling to find the info I need...
Cheers....
YGM.
Edenvalleyboy - I have the Bontrager Rythm Elite wheels and they have DT Swiss Onyx hubs - re-badged as Bontrager.
Yours might be the same - look at the ONYX 135mm Disc Brake diagrams in this service manual:
https://www.dtswiss.com/Resources/Support/HUBS/DT-Swiss-Hubs-Onyx,-Cerit-Technical-Manual
It's dual language English-German, but don't be put off, if you have Onyx hubs, this is all you need. You will find plenty of spare parts if you Google 'DT Swiss Onyx hubs', mainly because they are not very weather resistant and need looking after.
HTH - Justin