During and after my flight testing with wheel pants off and on, heavy wing balanced, I still found I had a slight bit of rudder I needed in cruise. Seemed to be consistent regardless of speed. And I had built a little offset in the vertical knowing this was probably going to be an issue.
SO: got a piece of pine and carved it into a long, flat skinny wedge. Duct taped it on. It was on and off several times before I found how thick and where to put it. Then flew it for a while with that in place. When I was satisfied with where it was, made one out of a slab of scrap aluminum from my build. I still duct taped that on and flew it to make sure it was right. Has been on ever since. No adjustment necessary and cruises feet on the floor.
1946 C-90-8 J-3 Cub
The adventure begins when things stop going as planned - Glen Heggstad