[Cool Hand Lurker]

For the roller I used a couple of spray can covers and duct taped them together at the open ends then drilled a 1/8" hole in the middle so they were fairly balanced. A welding rod pushed through the end holes and through holes in the bucket support the roller. Artistic application of the peanut butter can rebalance the roller so it will rotate easily. I don't use a ramp but I do put it near something higher, like a box. My peanut butter is a couple of years old but I still got a couple of those little bstrds this week. I just replenish it to rebalance the roller.

For side entertainment you could install a motion activated webcam & light to catch the evening Acrobatic Rodent Diver show and play it for your friends at halftime.