The bottom lever for extending the bottom leg, snapped off when I pushed the lever to secure the leg in place. No excessive force was used, as these levers are plastic. I checked online and saw reviews complaining about the same thing happening within the first couple uses of the monopod. Apparently the levers are made of cheap brittle plastic. When rotated, the lever causes a piece of plastic to push against the extended leg, like a brake, locking the leg into place. Otherwise the monopod is very nice. Rather than returning it, I wonder if there is a way to fix it or make a make-shift lever that will lock the bottom leg in place.
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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!!!
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.
If the leg lock is still there in one piece, should be no issue. If you notice, the leg lock covers bothe an upper part of the leg and a smaller diameter lower part. Take a socket (8mm if I remember corectly) and barley tighten the nits on the bottom half of the locfk. Loosen and tighten nuts until rasing and lowering leg is no issue.
Each leg lock has a leg locking lever and a screw that hold the clamp assembly tight to the leg. Unlock the leg lock lever, loosen the screw above it that holds the clamp tight to the leg. The legs should fit into each other sice each leg is slightly larger or smaller then then next one. Slide the clamps in the approprite places and tighten the screw enough to hold the clamp assembly tight, but do not over tighten it. Over tightening will damage the 679 tubes.
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.
Call Ritz Camera at 877-999-RITZ (7489). They "might" be able to assist you. Ritz's generic lenses are Quantaray made by Sigma. I don't know who makes the tripod. They are able to provide documentation for you, but I don't know if they will. Ritz has an online help form that you can fill out on their web site also
The little 'hooks' on the bottom of the legs 'snap' into each other to secure the legs together. Each leg has a 'hook snap' which clicks into place with the other legs. It is merely a way to secure the legs from flopping open. I bought the same tripod, a good solid piece of equipment. No instructions but its easy enough to figure out. Hope this helps.
Vivitar has been out of the tripod business for a few years now. They may no longer have the parts. You may be able to find another V900 and scavage the parts. Make sure the model numbers match exactly. The V900SE is a different year and does not share the same parts as the V900.
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.