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The major difference between our old prototype and this one is the braking mechanism. We wanted to increase the effective surface area and be able to control it better so created these "fins" as you tighten the fine control knob on the side they will put pressure on the resistance ring and thus provide smooth motion.
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For the weight conscious photographers, this isn't featherlight, but its all made out of aircraft aluminum and with steel ball bearings, instead of plastic hardware. If there is enough interest we may even create a carbon fiber arm.