You can use a zip tie or a chopstick and a rubber band attached to a frame stay as a quick and dirty truing stand, and I've done both, but for about a year now I've had this idea knocking around in my head. Clip it to a stay with a rubber band or a hair tie and you're all set. About the same size/weight as a Bic lighter, probably a pretty good tool to just have knocking around in a center console or glove box or in the bottom of a pack.