I have a series 6 wing which I believe is the same as the series 5 and 7 (non-STI) wings. I laid out a good pattern on my wing top that misses all the internal structure. Starting at 4" from the trailing edge and working forward my spacing on the top is 3.5". The spacing on the bottom, starting at the same 4" forward of the trailing edge is 3 3/8". I'm not sure what the distance across the wing length is starting at the butt rib that accounts for the "prop wash" area. I'll cut the rib lacing spacing in half within that area. So, which cap ribs should be laced at half these spacing lengths within the "prop wash"? Looking for some enlightenment.