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Tijs
ghostface
The circlips don’t hold the bearings in place and there is only one circlip which is on the drive side - it is there to hold the drive side arm in place in case the hirth joint bolt fails. You should only need one wavy washer on the non drive side - the circlip notches in to two small holes on the drive side cup.
Anyone that has used a p2m Campagnolo power meter will tell you how much of a nightmare it is to fit the circlip because of the crank spider (especially if using a press fit bb) and when in fact I queried this with p2m they told me to not bother with the circlip. Considering you torque the hirth bolt to anywhere between 42-50 nm you shouldn’t find it comes undone!
This is the circlip you need