[EricH]

Originally Posted by that sk8er dude

can you use a vacuume to hold a ball in place... is that legal?

Provided that you don't pull the ball to more than 3" inside the frame perimeter, and that your particular device satisfies all the applicable robot rules from Section 8 of the Manual, yes. Search CD using the search term "suction" and I can almost guarantee you'll find at least one thread discussing it.