An elastic band is fitted between the wheelchair (Panthera) rear frame and the brake track (connection between the brakes) instead of the two springs on Panthera Original.
The problem was that the springs on the Panthera that pull back on the brakes fall back down when you put the chair down to get it into the car, which makes it difficult to put the wheels back on. The elastic band has to be replaced about three times a year. The elastic band has to be angled correctly, so it pulls in the right direction.
Sewing supply store
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This tip is from 2005