I seem to recall a Van's approved fix for when the longeron holes are too close to the edge. I cannot find it now but it involved replacing the small spacer under the two bolts with one which was much bigger to include four rivets along the longeron forward and aft of the attach bolts. Can anyone find this thread/diagram/picture?
Might be something worth adding to this thread for future reference.
O-360-A1F6 (parallel valve) 180HP
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada