[KensRedZed]

Jason,

A few urethane and steel washers were also sent. You'll see them on every car I make. They allow body float.

Trouble is I prefer 4-40 threads, and these are made in 2-56 size. So I add a 2.5mm washer to prevent the urethane washer from slipping through the 4-40 hole.

Here are the parts before the body posts are epoxied inside the body.

   

The posts are screwed directly to the chassis and tested for body height, and adjusted several times until the body sits the way you want. Then the posts are epoxied in place. No washers are used. This makes sure the chassis and brass inserts are perfectly level with each other.

   

Then the washers are added. Steel washer - cup side down to the chassis. Then the urethane washer - also cup side down to the steel washer. This brings the body 0.7mm higher than without the washers. Remember to adjust your body posts 0.7mm lower than the target height when you epoxy them in place. The urethane washers conveniently hold the steel washers and screws in place whenever the body is removed. One might think this was planned? Nope, fluke.

   

Then re-attach the body and the posts should look like this.

   

The body screws should only be snug enough to make the body return to level. It takes a bit of effort, but the body can float quite far to either side and always has self correcting characteristics.

   
   
   

The improvement in handling with urethane washers is like night and day.