Rear cantilever brake hanger
thingiverse
https://www.google.com/search?q= cantilever+brake+hanger&rlz=1C1CHBD_enUS706US706&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwikwNnUp-_QAhVHHGMKHRymDrMQsAQIkwE&biw=1270&bih=1330 Mimics the functionality of these devices. Security: avoid making this using 3D printing. It's likely to fail. I've never tested this design, and I haven't even verified the entrance angle. It's engineered to accept a standard 5 mm brake ferrule (as far as I know). I might create a version that accepts a barrel adjuster in the future (for modeling purposes only). Probably not unless I get feedback from others. Designed to fit using a 4 mm bolt for a seat post clamp.
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