Originally Posted by rcmiket

Fill the shock. Let air bubble out. Compress the shaft till about 10mm of the shaft is exposed above the eyelet. Put bladder in place, making sure it is seated on the shock body. Some oil will ooze out. Pull the shaft out of the shock about 5mm. This will suck the bladder tight to the body. Carefully screw the cap on. Before releasing the shaft, make sure the cap is tight. That will do it. If you hear some squishing noises, it is probably the bladder squeaking. I drove myself crazy trying to cure the squeaking, don't worry about it though.
Good luck!