Ensure the 4 bolts are just barely snug. Adjust the adjustment screw until the gears are almost fully engaged. You should still be able to feel some backlash between the gears.
Place an indicator on one of the teeth of the C-axis gear.
Warning: Do not jog the C-axis without first removing the indicator.
Adjust the adjustment screw, while gently moving the gear back and forth by hand, until the backlash is between .002" to .003".
Remove the indicator and hand jog to 90, 180, and 270 degrees, checking the backlash at each point.
Go to the spot with the least amount of backlash, this should be the high spot.
Continue adjusting the backlash here until it is between .0003 to .0005" at the high spot. Torque the 4 cylinder block bolts and verify that the backlash is still within range.
Remove the indicator and disengage the C-Axis by pressing the [E-Stop] and [RESET].