I've looked at a couple pictures and I'm thinking of building my own automatic ball lifting system. I really don't want to buy one and I would rather build it into the cabinet that houses the machine anyway.

Am I correct in assuming that basically all a ball lift assembly is comprised of is a catch tray that funnels down to a cog that pushes the pachinko balls up a shaft (using them in a solid line) until they reach the top where they drop out into the ball tray?