3. Install the EAF Shaft Coupler
The ZWO EAF includes several different shaft couplers, and for the Quattro you will use the
one with a 4mm hole on one side. Note that the coupler should slide on until you can
tighten the lock screw just outside the focuser pinion block. Do not slide the coupler all
the way into the hole that the focus knob came out of.
4. Install EAF Motor
This step differs slightly depending on the focuser version. One version has a tapered white
section above the top side of the black pinion block while the other does not. More of the
top (eyepiece side) of the black pinion block is visible on the latter type.
For the first version, install the EAF motor so the motor end of the shaft coupler is flush
with the face of the EAF. The EAF has a recessed cutout here, so the coupler is still about
1mm from touching that recessed surface. But the coupler should be even with the flat
face of the EAF motor.