[KensRedZed]

Hello LHP,

It really depends on what chassis you have to start with.

Brass inserts in Evergreen styrene tubing with screws is very common. 2-56 or 4-40 size threads will both work. 4-40 being a bit stronger, but heavier.

   

I mount the body posts to the chassis and shave the posts until they sit at the desired height. It takes several tries to get it right.

   

For this car I used razor blades under the rocker panels to help the body sit even on the posts.

   
   

My apologies for switching cars but the McLaren isn't quite finished yet. The body posts are epoxied into the body while the posts are still attached to the chassis. Everything needs to line up while doing this step. 5-minutes later, you have a car in one piece.

   
   
   

I use countersunk screws to allow the chassis to sit close to the track.

I hope this helps?

Ken