Rd Frame Chheer

Poor design these. They should have used an expanding bush but we simply have a rubber tube and threaded bush and they stick in if keep the screw in. And otherwise you have the bits left behind ... Anyway just put the screw through the filler disk thing put the rubber over the screw. Screw on the bush till it grips the rubber tube .Then refit the assembly onto bike and tighten the screw ..