[Kris Verdeyen]

Oh - I just thought of something - you probably have already visited it...

If you use more than one ziptie per loop - put one into the the head of another one, etc - you could get longer tails for the ball collection, and more of them, spaced evenly around the wheel.

I have to say this, even though it may make some people uncomfortable, but I truly love zipties. They're so elegant - permanent, yet disposable. Strong, yet flexible. Ubiquitous, yet somehow.... special. I was seriously more excited about the collector than the obviously cool part of the picture: a 4 wheel holonomic base.