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-Providing that the image shown is the tripod you own..., the top leg lock levers on each leg is designed to lock the spreader angle of each leg.
-If this is not holding the leg at the correct angle...., either you are putting more weight on it than it was designed to hold..., or the 'cam' on the various locks has worn.
-A 'stop gap' fix for this problem is to insert a very thin wedge between the lever & the leg tube..., thus providing a greater amount of pressure on the tube, (this would need to be done every time the tripod is set up).
-Replacement parts are not available for this tripod & they were not designed to be user serviceable ...., sorry!!!
www.bogentripodparts.com you may need a new leg lock, you have to loosen it enough and the leg should come out. Send us some pictures at email@example.com and we will probably be able to set you up with something.
I had the same problem with the Manfrotto 685B, and it was due to the grease from the middle section leaking into its locking mechanism. I fixed the problem by:
1. Detach the middle from the bottom section by twisting the metal hub between them counterclockwise.
2. Wipe the grease off from the middle section's locking mechanism, especially from the three gray protrusions.
3. Use a bit of dish detergent to degrease the inside shaft of the bottom section.
4. Dry thoroughly.
5. Reassemble the section back, pressing the monopod release lever to facilitate the insertion. Reclose the metal hub.
Use an 8mm, I believe, socket and tighten 1/4 turn the nuts on the lower half of the leg lock. For instance, the top leg lock is connected to the top and middle leg. Tighten the lower 2 nuts (located on the middle leg half of the lock) 1/5 turn. If that does not do it, tighten 1/4 turn again. Be sure not to over-tighten.
If you notice, the legs locks are attached to bothe the upper part of the leg and the sloghtly smaller diameter lower. Take a socket (8mm I believe) and tighten the lower 2 nuts to the bottom of the leg lock.
There should be a nut on the other side of the housing of the tightening lever that you can tighten. Turn the lever to unlock the leg then start with 1/8 th turns of the nut to tighten, then turn the lever to lock the leg. Do this until you get the desired locking.
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 firstname.lastname@example.org if you have questions. -Spencer
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.