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Maybe I'm missing something, but how did you get your chain in there?
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You drop the chain and sprockets straight into the tube from one end. Then, while the sprockets are approximately in position, you slip your shaft into place and put the backside bearing in.
We ran this setup all year without maintenance.
221 Robotic Systems is launching a production version based on this design for 2014. Personally I loved the space we gained back by moving the chains inside and the weight saved by removing the tensioning device.