>>1488883today the spring in my rear rim brake snapped, the brakes don't spring back when I let go of the lever now, they just rub on the rim. I can't seem to find replacement springs available anywhere and I don't want to rebuy the whole brake assembly since the rest of it is fine. Any idea what I can do?
The brake is unbranded but is pretty similar to pic related or a Tektro R539. Not sure how to ID it. The bike was from a local bike shop that handbuilds their frames with custom components. I can't go in because they're shut due to COVID.
