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This is a good source for different chain paths:

Improved chain tensioning for top beam configuration

The last couple weeks have been dominated by getting this batch of machines put together and it’s become clear that one hardware area that we need to improve is the system which tensions the slack side of the chain. The bungee cords that we have been using which worked well in the vertical configuration are simply not strong enough. How should we handle this? Should we go with a thicker bungee cord? Should we switch to a counterweight system? What are the solutions that folks are using, what w…