What is this bolt for?

[CrisZenithBlue]

the way i adjust them is i make sure there is enough tension in the cables so that when i want to pop them out of the lower ball (the one next to the bolt) i actually have to push down a bit on the back end of the top frame edge so it gives some slack in the cables making them easy to pop out.

[CoBeerToad]

I was thinking tension rope was just a name and not that they actually applied tension. I swear my brain is in off mode whenever I leave work. (My boss probably says the opposite is true.)

Thanks.