On the velbon vgb 3, the leg locks consist of a lever, one or two pieces of metal and a plastic piece. The metal and plastic pieces rest in a depression against the lever. When the lever is pulled out, pressure against the smaller leg section is released. When the lever is pushed in, pressure against the smaller leg section is exerted, locking the legs in place. On the back side of each joint, there is a phillips head screw which acts as a stop to keep the leg section from coming all the way out. When the screw is backed out, the leg section can be removed, exposing the latching mechanism. If the only problem is that the latch mechanism came apart, it can simply be reassembled. If, however, something broke and allowed the latch assemby to come apart, that will have to be dealt with as well. My guess is that the phillips screw may have become loose, and the latch came apart.
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Maybe it could be the clasps not the locks that are broken if you need it functioning right away wedge something in between the clasps, and locks, or the clasps could be over expanded shortten that, and you'd be set.
Assuming you still have the female part with the treads in tact, you can do what I did. I used a hose clamp, the kind used on radiators, but larger. First, take off the lock down knob, then put the hose clamp over the broken plastic housing and mark where the knob would screw through. Then remove the hose clamp, placing it on a sturdy surface and use a 5/16 drill bit to make a hole where the lock down know will pass through. Place the hose clamp over the plastic housing, insert the knob, tighten the hose clamp (but not so much that it restricts the tripod leg from moving) and you are done! I can send you pictures of the process and the final result. It saved me from buying a new tripod! I can be e-mailed at email@example.com if you have questions. -Spencer
Hey there fotoflika, I have had a similiar problem in the past and found replacement parts unavailable. My solution was to drill a small hole through the leg section, and I used a similiar size allen key to stick in the hole, effectively locking the leg in place. You could drill several holes for different extension lengths. Crude I admit, but cheaper than buying a new tripod.
take it apart, there is a rubber ring like a belt or rubber band, either broken or missing. you will have to find a relacement for that, may have to take apart another leg to have one to compare, course I don't honestly know where you will find that piece. too take it apart just keep spinning the lock counterclockwise until it comes off. good luck.