[EricH]

Originally Posted by Urban Hawk

when i talk about that spring mechanism i mearly mean something that can take the blow with the bumper so you either dont get it snaped off on impact or be compleatly stiff and have it take the entire force of the blow from the robot rather then the bumper. it would not be somthing not something that would change

(i have to turn off computer and head back to my house so ill answer second part of question when i get back on there)

In other words, an articulated bumper. Just be sure you expand the bumper perimeter accordingly.