Campagnolo front mech circlip advice needed

It's probably worth trying imperial sizes.

I was replacing the e-clip on an Ofmega QR a couple of years back and had a hell of a time getting a metric one on.
Then I tried 3/16" and it went on in 5 secs.

Here's my notes from the time:

Metric E Clips (D1500 / DIN6799) are always listed by the groove size they’re fitting in to on the shaft. For example if you have a 5mm groove on your shaft, you will need to order a 5mm E Clip, this should then fit a shaft size of between 6mm – 8mm.

Imperial E Clips (N1500) on the other hand, are always measured by shaft size. For example if you have a 5/32″ shaft you will need a 5/32″ E Clip.​
 
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