Originally Posted by Granpa

DO NOT, I repeat, DO NOT build your shocks as shown in that blog. If you do, you'll ruin the o-ring. The likelihood of getting a shock that leaks is quite high following those directions. The correct way is to extend the shock shaft piston assembly thru the shock body, lube the shock shaft threads, slide the o-ring over the shock shaft. Then the small plastic spacer, then the larger one, watch the orientation, then and only then screw one the cap.

When you put the o-ring and spacers in the or on the shock body, and then screw on the cap, you will compress the o-ring slightly. This will make the hole in the o-ring smaller. Shoving the sharp threads of the shock shaft thru a compressed o-ring, even if you lube or green slime it, will damage the o-ring. The o-ring was designed to compress onto the shock shaft when the end cap is tightened. This is what gives you the seal.

Now, Sosidge, whose opinions I often agree with, inadvertently opened a whole new can of worms. The method he described for filling the shocks will give you a shock with a lot of rebound. This may be what you want on certain track surfaces and layouts. In other situations you may want a lot less rebound or even zero rebound. I'm not going to post how to do this, but most good TC drivers can show you.