You have broken the nipple because you didn't remove the Tracomp Ring before attempting to turn the nipple.
The Tracomp Ring is in the hub and locks all the spokes in place.
You would need a new Tracomp Ring as they cannot be reused and obviously a spoke.
The old spoke can be cut out and the nipple removed with a thread extractor.
All the parts are dirctly available from Mavic.
Just remember to replace spoke, true wheel and lastly install the Tracomp Ring.
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Help I'm Being Oppressed
You'd need to buy a new spoke surely? :?
The Tracomp Ring is in the hub and locks all the spokes in place.
You would need a new Tracomp Ring as they cannot be reused and obviously a spoke.
The old spoke can be cut out and the nipple removed with a thread extractor.
All the parts are dirctly available from Mavic.
Just remember to replace spoke, true wheel and lastly install the Tracomp Ring.
William Wark : There is no adjustment at the hub. I should have said the wheels predate the Tracomp ring.
Anyway, the screw extractor head snapped in the seized nipple - should have drilled it.