I also have a thin(ner than regular) SW in the M3W, in my case the Brooklands model, but I think its radius is smaller than yours.
As BurgundyMog I have a Mota Lita wheel model fitted to my Plus 4 (very similar to the one you have in your M3W) and I like the "feel" of that wheel a lot (and to add it looks great too!)
Last edited by MarioCP; 19/12/14 08:59 PM.