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hmm
I dunno. I'll see. That kind of thing bugs me, when it could be perfectly true.
I'd have to take it to someone, no way I could true it perfect. I know my weaknesses.
skinny-
Chances are it's one nipple that's loosened about 1/4 turn.
If you can spin it, stop it (using the brake) at the offending point, then check inside the rim for the offending nipple, you'll probably be able to true it with a flathead screwdriver.
If it doesn't work, or you bottle it, take it to a mech, but if you sort it, you've saved yourself a trip.EDIT: Ignore! Forgot that although it's a fairing disc, there aren't really any methods of determining whether a given nipple/spoke goes to NDS or DS without prior knowledge of the wheel/rim.
EDIT EDIT: The offending nipple/spoke could be identified by counting around (clockwise from valve hole, viewed from DS) using an image of a HED C2 rim/Ardennes wheel (same rim used on disc IIRC) for reference. Looking at most wheels on their website, the first spoke viewed from this angle goes to NDS.
Lukas
I'd be well happy with just 0.5mm out of true.