David HopkinsKnocked this up last night from plasticard and spare bits
servo is a HK15138 3.8Kg-cm servo from hobbyking (£2.22)
calculated exerting 5.4Kg at start of travel building to technically infinite at end of travel, either way, plenty of force to clamp the tube properly. bolts used for easy adjustment.
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This is an interesting idea. We're using solinoid valves that are about the same price for our project. http://www.ebay.com/itm/1-4-NPT-Electric-Solenoid-Valve-12-Volt-DC-12VDC-N-C-RO-Air-WaterBBTF-12pk-/272050889127?hash=item3f577f21a7
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