[quote=tominpa]I think the rivets are already 1/4 dia by 3/16 length. The next size up would be 3/16 x 3/16.
I'm not sure how the old 5.7 is constructed with regard to bulkheads. I suspect there is one just in front of the rear crossbeam. Anyone know? How far in front of that do I need to stay? What I don't want to do is place a port where I would sit.[/quote]
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