In 2014 our team decided to make a pvc cage that slid on drawer sliders it went backwards to allow our catapult to go down and then catch the ball and forwards once the ball was catapulted (turns out drawer sliders aren't meant to be torqued) we had cables attached to the base of the robot and the cage which in the end didn't help. In about 4 of our matches our catch fell off and bent the drawer sliders....in one match we drug the cage around slowly accumulating more and more penalty points. you can see one of the matches here:
https://youtu.be/9KtJB_j8s_Q?list=PL...kGEuzrpMogT S (skip to 2:04 where come into view and wait a few seconds)