I use a piece of pvc pipe to push down on the bladder retainer on the reservoir(the part with the schraeder valve) to remove the clip holding the bladder in the reservoir. I cut a slot in another pvc pipe piece to use to push the seal head into the shock before i reinstall the large retaining circlip in the actual shock shaft body. Total cost of "special shock repair tools": .$1.09.
The only tricky part is machining away the staked-over threads that hold the piston and valve stax on the shaft. I used a dremel and carefully ground the top two or three threads at about a 45 degree angle so that the retaining bolt would come off. I used a new nut and red loctite to reassemble. I use 'hydraulic, non-foaming' oil in my shock and forks. Its extremely light viscosity and is cheap. It also works just fine regardless of what "experts" will say. Suspension is simply hydraulic cylinders
Ill take pics of my "tools" tomorrow for you. By the way: i use air instead of nitrogen, but i only use about 110-115psi in my shocks. If your compressor has a moisture filter then air works fine. Itll still work without a filter but i prefer to use one. My rear shock feels absolutely awesome-but I trailride only. If youre going to jump everything in sight, use nitrogen at the proper psi.