Any question answered...

Shorten the outers a bit so that the cables find their own line which is a bit straighter. On those kinds of cheap aluminium frames, the stops are probably set into the frame like a riv-nut, pretty hard to fix once they get loose. It's worth trying to get some glue in there, but don't hold out too much hope of getting a secure and permanent bond.

Thanks as always mdcc.
The frame wasn't exactly cheap when I bought it 15 years ago, but sentimentality keeps it on the road.