I have an old Gitzo 1325 which does not have the anti-twist legs. It is still sold as a rock, but the legs are getting more and more difficult to manipulate. I was thinking I would buy the inner leg workings, take it apart and rebuild it. Problem is I am having trouble finding parts and instructions. I have looked online, but parts suppliers, including Gitzo itself make it extremely difficult to determine if they are the right ones for my tripod. Any advice here would be appreciated.