George: Just what I needed to know. I'll use a squeeze bottle and fill it just as I fill my transmission: fill until it flows out (finds its proper level naturally) and then replace the plug.
My one concern was whether, when opening the plug on the side, if the unit was not positioned properly, the fluid might be forced out in some way. I have read in another forum posting that when some guy opened his plug, the fluid "shot out." Someone who answered him suggested that someone had overfilled the shock and pressure had built up.... I assume, from what you have written, that I don't have be concerned about this or position the unit or the lever in any special way, other than to jack up the car and remove the wheel.
With the VA DOT hard pressed for funds, our roads are becoming rougher to ride. Thus, need for fully functioning shocks... (ha, ha)
Randall: Many thanks for the photo! These ALWAYS help.
BTW. I see now in the Moss catalog illustration of the rear shock absorber that the plug is shown, but not labeled. Every other component is labeled, but not the plug. Go figure?