[MrForbes]

We're removing the second reduction stage in the KOP transmissions, so it is only a 3.57:1 reduction, and adding more reduction on the chain drive.

The change seems to be easy to make, you have to flip over the aluminum plate (to get the right size bearings in the correct place) and punch new holes in it to clear the ends of the CIM shafts, and add a washer next to the roll pin to keep the big gear on the output shaft from moving sideways too much. Looks like a common modification.