Where can I get a clamp-on cable guide?
You don't need one, just insert a bit of cable outer between the guide on the seat lug and the v-brake noodle
I did try that, but couldn't see a way to get the cable outer to run neatly. Maybe with an extra bendy noodle. Also seems like it would be really draggy
Maybe try a 3.7mm to 5mm stepped ferrule to align the outer with the guide.
@TvH started
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You don't need one, just insert a bit of cable outer between the guide on the seat lug and the v-brake noodle