Elvo's guide is good to read
http://users.telenet.be/elvo/.
This page is a handy reference
http://users.telenet.be/elvo/15/1_content.html
I've got rid of the play in my front joints to tighten up the stearing as well, just used small bits of fuel line for plans (or air line from a fish shop), cut a bit off and put it over the ball joint, tightens it up a bit.