Without knowing the brand of tripod i cannot help.
There are some brands of tripods that are made for the retailer and the name is licensed, so the name brand does not support or stock repair parts. Especially if the tripod is an inexpensive one.
Because of the model and make of you tripod, I would recommend you throw it out and buy another one.
In my opinion Slik and Manfrotto are two very good ones.
Slik for the lesser expensive and Manfrotto for the more durable, expensive, parts are almost always available unless is it really old tripod.
Find some Manfrotto tripods at:
www.BogenTripodParts.com
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