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The handle system in its entirety:

Because the chain wraps around a sprocket-pulley, it's as if there are two chains running right next to each other, in opposite directions. We made sure the chains didn't criss-cross in order to make sure the chain runs smoothly, noiselessly, and without wear-and-tear.

This process took a lot of concentration and time in order to get right. Some things to keep in mind for next time:

• Each end of the metal bar has two opposing metal axles for the pulleys and black plastic housing. One of these axles is longer than the others, and the black triangular shaped plastic chain feeder is fixed there. Don't use a retaining ring on the triangle piece yet, but just note where it goes.
• The white pulleys have to go on opposite sides and opposite ends of the metal bar. Place them on the axles and fix them using retaining rings.
• When setting up the bungee system, eliminate all pre-tension. When the chain and bungee and plastic bits are all on the metal bar, slide the system into the erg, and then pre-tension is easily adjustable.
• Make sure the chains do not criss-cross.
• The black triangle piece must point upwards in order to feed the chain upwards.