Although someone had painted the heads silver, the original rear wing retaining screws were rusty – to the point one had seized fast and had to be cut out when we took the wings off during the rechassis.
SPOG do replacement stainless screws for these so I picked up a pack.
As we’d done the hard work when we took the wings off, and had reassembled using copper grease, the old screws came out one at at time to be replaced with a new one.
As the rivnut at the bottom of the offside wing had been seized to the screw and had come out I used a flanged stainless nylock nut for that screw. (Standard M5 0.8 thread.)