Drill the seat stay bridge vertically - Allen bolt down and through mudguard.
That's fine for that bit, and I can get p-clips or axle mounts for the stays. The problem is there's no chainstay bridge or pulley mount to attach to
What about one of those bottle cage bracket things reversed at the bottom of the seat tube?
@TvH started
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Drill the seat stay bridge vertically - Allen bolt down and through mudguard.