The 3781-3 Spread-Loc Mid-Level Spreader with Rubber Feet from Vinten is a fully adjustable, geared mid-level spreader controlled by a single-lock knob. The arms are individually extendable to provide a large spreader radius and facilitate use on uneven ground. The Spread-Loc spreader may be installed on any tripod with Spread-Loc attachment points. It fits all Pozi-Loc 75, 100, and 150mm bowl tripods and Torque-Safe ENG tripods (from October 2001).
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Twist of a knob and it's ready to open, twist again and it's locked solid. Arms also will extend out individually with the press of a button for uneven ground or for shooting in and weird and awkward configuration.
I chose this Mid-Level spreader for use with my Vinten 3776-3 ENG Carbon Fiber 2-Stage Pozi-Loc Tripod Legs. It's especially good for use outdoors; but, really it's useful anywhere. Installing on the legs was a snap. Setup is fast no futzing with this leg falling that way and the others falling another. The pleasant surprise is the fact that this spreader is geared and uniformly spreads the legs -- awesome! What's more, it has a locking/unlocking dial with easy to read symbols for my aging eyes; AND, if you forget it's locked -- surprise, surprise -- there's a clutch mechanism that gives way instead of your tripod or spreader or worse breaking. The rubber feet take the edge off the spikes adding a level of protection for indoor carpets, tile, and hardwood floors.