[mrnoble]

It's really just about 55" inches from the base of the bot (where the springs will start) to the end of the telescoping arm(s), where a hook will be located. The 70" allows for full extension without losing any force at the end. Happy to share our ideas. We are building two bots right now, one is a "normal" driver/shooter, the other a dedicated climber. Two extending hook "arms", two stationary hook "feet". In theory it works for any height. In practice, we having difficulty finding a few of the parts we want.