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You could use a rivnut (nutsert) to replace the thread fixed to a u shape metal bracket attached around the plastic. Ive attached a photo of a repair I made to a light tripod, yours would be easier. Its actually stronger than the original. The nutserts are on ebay and so are the thumbscrews to replace the knobs. You only need a socket head screw, nut, allen key and spanner to attach the nutserts.
Al
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