Of my few run-ins with people wanting larger holes for galvanized parts I did
realize one thing. Every fabrication problem was blamed on the 1/16" holes.
As I pointed out to them, I seem to recall fit-up problems on a bunch of jobs
that did not have any galvanizing. Galvanizing seems to be a nice place to
blame to all fit-up problems. I remember one complaint I specifially looked
at, was misaligned more than a 1/4". I do not see how allowing an 1/8"
oversize hole would correct that.
My 37 cents