[ercoupe-tech] (Major assembly -center section)

[ebenguiat1]

    From Skyport Services Ercoupe Parts Catalog
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(Major assembly -center section) 
I also have several threaded holes on Item √
3-4      SA -5        Diagonal Rib 
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Also seems to be four of something on top of item ¨ beam assembly
(2 on the left forward edge and 2 on the right forward edge)
Anyone know what they are?
Ed