M8 bolt, correct for all current model Avian gliders and wings (Fly, Rio2, Puma, RioT and Evo with Speed or Rubber Backed Aerofoil control frame)
This is the bolt that links the top of the uprights to the keel. It is often bent if you have a heavy landing. The way to check whether the bolt is bent is to remove the bolt and roll the shaft along a flat surface. Looking from the side, along the level of the table, if you see the bolt moving up and down as it rolls then it is bent. Often if you have a heavy landing that surprisingly DOESN'T bend an upright you may well find that the bolt is bent instead!
Nyloc nuts should always be replaced, not reused the bolt comes with a new nut and pair of washers.
Why is it so expensive?
Unfortunately we can't get these bolts from stock, they have to be cut down to the right length which makes them more expensive than a stock bolt.
