Effective Bumper Mounting Systems

So we got the Andymark bumper mounting kit from the kit of parts. However, we noticed that in the square configuration, these bumper mounts don’t really work due to the plastic pulleys getting in the way. So unless I’m missing something, we need to make our own bumper mounting system.

Does anyone have any recommendations for bumper mounting, or would a simple screw-in system work just fine? Preferably nothing too fancy since we are running on a limited budget (probably not too much of an issue if it’s just bumpers…).

If you can somehow integrate this mounting system into your robot, its super simple to take your bumpers on and off: http://www.robopromo.com/category_s/1832.htm. And it’s also really easy to do!