Good idea ksisler! I'll check that. I think the final solution will be a thin washer between the chainring and crank. As a previous poster mentioned, I want to get well machined thin washers that just fit and don't stick out past the spindle spider. I tried it with some old washers I had and everything worked fine. It let me use the 4 large cogs without any rubbing. Once I got to the 5th cog you could hear a hint of rubbing. By that time I should have shifted into my middle ring anyway! So I think all will be good with the shims.