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The end looks frayed and that might be the problem. Maybe try a bench grind or a Dremmel to get a clean flat cut.
Or could the yellowish bit be the problem? Try trimming that so it's flushed with the black casing?
coventry_eagle-
It's a slightly confusing pic - so the cable was all nice and squared off with the dremmel but it was just slightly too big for the hole.
So I've stripped off the black rubber and cut back the yellow kevlar/cotton (whatever it is!) to make the diameter smaller - that's why you can see the frayed ends of yellow stuff, and indeed, why the end of the cable itself is now slightly botched in the photo - I've tidied that up again.
Essentially just worried I've ruined the structural integrity of the cable by stripping half of it away! Sod it, might just get some more of the jagwire I know that fits.
Brookly_Bay
Forgive the cross-post from AQA, but before I send my partner out on a death trap...
Weirdly my compressionless cable housing won't fit into the shifter body (Tiagra 4700).
I've trimmed some of out the outer to make it so it can fit into the hole in the shifter (there is a small cable shaped hole it should go into - a different brand cable works on the other shifter), but that seems a little naughty. Likelihood of death?
Here's a pic of what I mean: