Building Schu Shocks:
1. I fill up my schu shocks all the way to the top of the body with oil.
2. Put a couple of drops of oil on top of the cartridge and pull the piston back into that oil puddle. This keeps air from getting trapped behind the piston.
3. Keep the piston pulled against the cartridge and out it into the shock body. Oil will be pushed out as you start to screw it in.
4. When the cartridge is in so that the seal o ring is 0.5mm from the body push the shock shaft all the way in. More oil will flow past the threads and out of the shock.
5. While keeping the piston pushed all the way in finish tightening the shock cartridge.
6. Check your shock rebound. They should all rebound ~5mm....if you are lucky...lol!
7. To equalize the shocks pick the one with the most rebound and side load the shock shaft and push it in all the way. You can use moderate force. You are trying to release tension from one side of the seal o-rings to allow a small drop of oil to burp past them. This reduces the internal oil volume and will reduce the rebound.
8. Burp all of you shock using this method until they all match the shock with the least rebound.
I do not like building shocks with lots of rebound. If one shock leaks a tiny bit of oil it will lose some rebound and you car will feel tweaked due to the mismatch. This is a real pain to spot on a race day. Like I said if you have ~5mm or less of rebound this will not be a problem.
Sales Manager Schumacher USA