[Ivan Helmrich]

Adam is probably right about the .8 mod but that would only be correct for the pinion and the first 2 plastic gears. Second to third is a larger tooth and third to fourth is larger yet.

Here are some approximate CC distances measured from the one in my basement:

Motor to #1 1.375” approximately
#1 to #2 1.630” measured across the idler shafts and subtracted .375”
#2 to #3 1.707” also measured across the shafts.
#3 to #4 2.247” approximately because there isn’t much to measure to on the last gear.

Ivan