Originally Posted by erchn

It is one the trickier parts of the chassis. A couple tips help:

1) Get the 70 durometer Tamiya x-rings (not 50), Blue Yokomo o-ring, or the Kyosho orange x-ring work pretty well too. That's my list, best first.
2) Definitely use green slime of some sort, though I recommend pre-soaking the o-rings first.
3) Thicker oil is better, luckily the latest setups (which are certainly the best) use 2500-3k most of the time.
4) When building, get the bottom or one side sealed up, fill and let bubbles raise to the surface. Now put the white shock guide on and make sure it is FULLY seated, then place cap and tighten. Do not over tighten. If the cap didn't screw down very far, there is too much oil in the shock, either way, let the shock sit for a couple minutes and try to tighten the cap down again.

Given that technique, I now go multiple race days without issue.

Ethan