[phrontist]

Wow, that's an absurdly large tube! We're talking about 7" balls right?!

I'm a programmer, so I may be off base here, but why would you ever need a roller that big to (presumably) pick up such small balls? Aren't you only increasing the mass of the cylinder you'll have to spin up... and keep under the weight limit?

We're currently planning on two much smaller rollers... is there something we're missing?

Or perhaps this will be mounted in the center of a fixed radius curve... and you need the surface area... but man, that's still huge.