Mono Shock

Shock Oil Refill

Remove the shock from the bike and put it in a vice so that the Schrader valve was on bottom.
Use a hand pump and pump a fair amount of air into it.
Remove the Schrader valve and the oil will spooge out as the air expels.
Repeat as necessary until empty.
Turn the shock the other way in the vice. Then hook the Mityvac to the valve port with a small piece of tubing.
Put a honking big vacuum on that port, and then pinch off the tubing with a hemostat or vice grips, near the shock.
Remove the Mityvac and place that end in a container that holds the appropriate amount of shock oil. Release the hemostat and the shock will fill itself.

Prolink Zerk fittings

http://webpages.charter.net/bpeloquin/prolink.html

Prolink Shock Rebuild (courtesy of Pete Springer)