I've had my Gitzo 1325 for a year or so (I think it's out of warranty). One of the legs has become loose inside the metal circular piece that attaches it to the tripod. I've taken the leg off and tried to figure out how it is secured into the metal piece with no luck. Does anyone know how I can tighten it up? It wiggles just a little bit, but it is annoying. TIA!