I've just repaired someone's Rogers domestic stereo valve amp. He wants something doing about the 12 'loose' phono (signal ) sockets on the rear. These are plated brass of the same material as paxolin backed tag board. Thin plated brass strip curved both ways ino a cylinder with a gap so of course opens out over time and use. They are easily accessible as a side panel is removable but anything better than just squashing each one with pliers. Rubber Hellerman sleeve slid over each with 3-jaw expander pliers is all i can think of but will it work?
Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on