I dropped off the gear today and talked with the guy at length. The only real challenge on it it is making the oval center part that fits around the shaft. I am out of town next week, and he said he would have me a price for the initial ten when I get back.
To show how brittle these things are, I was handing the gear that scrapdaddy sent me to the gear guru and somehow we dropped it. The small crack around the metal bushing in the center of the gear turned into a crack that goes to the outer edge, making it utterly worthless for use again. It is still intact, but it would burst if ever used again. It fell 3 feet and did this.