[EricH]

Having seen the robot in question myself, I'd say that you might want to look at that bar that keeps the balls in as a starting point. I think your best bet would be to replace that bar with the roller and tweak the lengths on that linkage system.

And remember, you can make the roller during your time here, but make sure it's less than 40 lbs with any other fabricated items needed for that or for the intake system. COTS items (say, motors) don't count in the allowance.

Note: These guys only have one more event: Atlanta. Best to make the stuff at their base and ship it there/put it in luggage.

Note 2: For those that didn't understand my first paragraph, their dumper looks like a flat piece of plywood with an aluminum bar on the open side. They fire one relatively small piston, and through a linkage set, the bar pops up and the back side of the plywood does the same.