here is a spare lock for Chinese tripods. They have the annoying tendency to always break on the top one. As I have several tripods broken at the photo club, I modeled this lock. Normally we only need the body, but by dismounting it, I realized that there were several pieces that made up the whole. I then made everything available.
the support tube is 0.8 inches (20mm) and the maintained tube is 0.65 inches (16.5mm). Be careful, the tubes must have grooves
any PLA or ABS and if possible TPU
If possible, print the pressure wedge with TPU 100% filling. It is because of her that the body breaks because there is nothing to lower the pressure on the plastic.