These notes concern how to fix a Manfrotto 190 XPROB Tripod if the fitting has become worn and/or damaged so that the centre column will no longer lock properly. Its a very quick and easy job. This took me about 30 minutes but that included figuring it out and messing about taking photos. I reckon that now I've done it, I could do it again in about 5 mins flat.
Whether this method can be applied to other tripods, I don't know. All I can say is that with this one it was very straightforward; I've no reason to think it wouldn't be with another brand or model.
86. How To Repair A Tripod