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Title: These are hit and miss
Review: I have used 4 of these. One is great and operates smoothly. 2 are ok, a little stiff now and then, and one you have to really push on. THen once it goes you sometimes hurt yourself on the metal. I am in the process of switching from Monfrotto tripods to Gitzo with Stroboframe QRs. The Stroboframe system is excellent and low profile. This RC4 system is part of most monfrotto upper-end heads and I actually have gone to Stroboframe QRs on the built in Monfrotto QRs. Redundant and silly but worth it.
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