Due to my earlier mistake (wrong direction for rear arm support) I had to do some trimming. This left the support for the arm with a crown under it. Hard to get a good picture, but this kinda shows the problem.
Here the chair is from the top with arm and back support bar temporarily in place.
Suggestions appreciated. So far the best thought I have is to take a power plane to it. I’ve leveled out doors before. Maybe using a guide bar. For sure marking it. Hard to nail it, but close may be good enough.
-- Doug - When all you own is a hammer, everything looks like a nail.