Ossur Certerus and proflex torsion repair kit
If you have a Ossur foot with a built in torsion and shock adapter with a bulb like pictured, they either get loose and twist or develop a tear at one of the clamps or both. Internally it is simply a tube with hard rubber not bonded which grinds to small pieces. It can be repaired by filling the joint with bonded flexible rubber. This will largely disable the torsion and shock effect but the foot itself usually never fails. Often you can buy one of these used like on eBay already damaged and not know it. This is a castable, non-shrinking, low-viscosity urethane compound that cures to a
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