Hi there.
I bought a set of wheels (Mavic crossmax)
the rear is 142 (12mm)
front is 100 (15mm)

I need to convert the rear to 135mm (9mm) and the front to 9mm to be used with a QR, so I bought some adapters that do just that.

I measured my rear hub and it is 142 from end to end. Each of the ends has this dark grey protruding end piece with a slot in it. If I were to remove these end-pieces, the hub would measure 135mm. Then I can slide the QR adapter inside, which will reduce the hollow axel to 9mm.

Any tips on how to remove these grey end pieces?
photos attached. I just don’t want to botch things up.





Thanks.