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the stock axle weighs nothing.
Not quite true, but close enough. Even my custom Ti one didn't save any weight compared with the stock aluminium one.
@Dandy is your axle thread M9×1? If so, you can just swap it for a bog standard Shimano hollow axle (Sora will do) and run an M6 tap into the ends to do the bolt-on conversion, that's probably the most aero but the Hed aluminium axle with a Ti Allen-key skewer is lighter.
Messing around? You saucy bint!
Not entirely sure what you're after: the stock axle weighs nothing.
I replaced mine with a somewhat heavier axle in order to convert it from QR to Allen screw.
Deets here. @Dandy