Steering should be exactly the same as the 418 I believe. I used a .15 shim instead of the stock .1. I tried doubling on on the .1 shims to make .2 but it starts binding up if you torque down the screw.
With the .15 shim, it is just right. Hardly any up/down movement, but the bellcranks move freely. The shim set I bought is a 3racing set from TQRC. I'll need to dig up the part number for the set.