I measure the gap between the top of the wheel and the guard first.
Then i work out how much i want to lower it.
If the gap is 3mm...thats how much i need to take out of a shock/spring etc.
I have the body on the chassis and have the car up side down at first.
Once i have cut the spring, i place it into the mounting place on the chassis.
If i need to i use tape to hold most things in place.
Then i lay i piece of flat wood(in pic) on top of the cars wheels and the carefully turn it over.
Then i muck around with a long tooth pick adjusting all the wheels to get the right angles etc.
Once i 'm happy with the set up, i then do the same again but with glue.
Once you have put the glue on you have to move pretty quickly before it sets