Elevator Design

[Adam.garcia]

I am in the process of designing a spool/cable driven elevator system, and have two questions regarding the design:

1. Currently, I have a powered up, gravity down continuous cable rigging system. However, I would like to also be able to power my elevator down. How do I change my cable routing to achieve this functionality?

2. For my counterbalance, I wish to use surgical tubing rather than a constant force spring,since teams in the past have had pretty serious injuries with constant force springs. What/where have teams purchased their surgical tubing to properly counterbalance their elevators.

Thanks for your responses in advance.