scott clark wrote:After looking at my Gitzo 1548, he said the top of the tripod "collar"/10mm hex nut, and plate design, are woefully inadequate to hold heavy, expensive camera equipment. Simply stated, it's too much weight cantilevered over ones shoulder and will eventually fail. He designed an incredibly brilliant system from his C & C machine (computer controlled cutting machine) that would make it virtually impossible for the mounting plate ever to separate from the tripod. Scott Clark
L.A., CA U.S.A.
This post had me thinking a bit. Took a look at my 3530LSV and noticed a grooved space on the inside part where the bolt in question is located and a similar space on the side directly opposite it. I was wondering what would happen if the lower or bottom part of the top plate had a minimal extension protruding from it on opposite sides. There isn't much room as you are dropping the top plate down into the base of the tripod collar. There is room however, where the 2 spaces are located so you can slide the top plate extension down the opening.
Once the top plate is resting on the tripod collar, you can twist the top plate so the extension at the bottom of the top plate is now "catching" onto that aluminum looking piece (appears glued or somehow bonded to the tripod collar) from the bottom. If you were to try and pull the top plate away from the tripod collar, you wouldn't be able to unless you first rotate the top plate so the "extensions" lined up with the 2 open spaces and then lift. The top plate side wall in its current design would have to be a slight bit longer as that aluminum piece appears to extend down further than the bottom of the top plate itself. Maybe this new "extension", now that it's catching onto the bottom of aluminum looking piece will prevent the top plate from suddenly falling out or away from the tripod collar.
This won't prevent the screw or bolt in question from loosening over time but at least there's something, however slight, holding the top plate onto the tripod collar and give some warning to the user that the bolt may have come loose. The problem I see in this idea is I'm not sure how much force that aluminum looking piece can sustain and I don't know by what means it is attached to the inside of the tripod collar. I'm no engineer but it's fun to play and thanks for indulging me

As for top plates seperating from the tripod/tripod collar I ran into a photographer who had that happen recently to his gear. Fortunately for him, he had already or was in the process of taking his 500mm Nikon lens off his Gitzo tripod. He expressed great surprise/shock that it happened but I mentioned the problem was currently being discussed on a photography forum. And to check the tightness of that bolt on a more regular basis. He said that's what he's going to do from now on. And just yesterday, I felt the need to mention the possible issue to another Nikon shooter. He owns a 600mm lens and a Gitzo tripod. Must be an older model because it looks a lot chunkier than the current 6x. Anyway, he noticed that the top plate was slowly working itself away from the tripod collar. I can't say for certain but we could see part of the top plate metal between the top plate and the base of the tripod collar. Said first thing he'll do when getting home is to loosen that bolt and then retighten it.
Proper maintenance will help to prevent that bolt from coming loose and with the current heightened awareness, maybe users will now check the bolt on a more regular basis. However, it wouldn't hurt to have some sort of failsafe or secondary mechanism in place in case people forget to tighten the bolt. You know, sort of like have in place a first and second line of defence.
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