Thanks James, I gave Martin gear a call, and found a borable gear the right size. 4.116 diameter, 12 DP, 48 teeth. Now, what I need to determine is the pressure angle I want to use. The gear train is worn enough that I don't think I will get a good measurement to do the math on the angle. I was going to just go with a 14.5 pressure angle with the thinking being that the steeper tooth would take up some of the wear better. Any thoughts there?