There are two structural items on your aircraft you shouldn't mess with in particular. Main Spar and Longerons. Please make them super correct. Sh... happens, just order new ones.
So, I countersunk the foreword upper holes in the longeron on my -14 instead of the lower holes the plans describe.
Fatal mistake and new longeron needed? OR, is there a workaround?
Oh, cant switch sides. Left side done correctly.