We fixed the handle bungee system housed inside the bar.

We changed pre-stretch to 8" in order to increase the back tension on the handle sprocket to reduce chain slippage.

One end of the handle system:

The picture below has been modified to outline the components of the handle system.

• The red line follows the metal bar that provides the structural basis for the system.
• The green line follows one end of the handle bungee, and this wraps around a cinch point that anchors down a part of the bungee cord, so the free end won't slip through. The free end can be lengthened to increase pre-stretch.
• The blue line follows the handle chain, which wraps around a freely-rotating sprocket located in the black plastic trapezoidal housing.
• The yellow line follows the other end of the handle bungee that is the attachment point between the bungee and the chain. The bungee wraps around a pulley (hidden in the back) and is then fixed to the black plastic housing, the intermediate connection between the bungee and the chain. The bungee is fixed to the plastic housing, while the chain can run along a freely-rotating sprocket in the housing, so this is essentially a floating pulley.