Originally Posted by JDA_BTR
turns out there is no spec. Tight enough to hold it on but not so tight as to ruin the fiberglass. Then lock wire to keep the nuts from backing out.
One guideline you might use is the tensile strength of gelcoat (~11000 psi) or epoxy (~12000 psi) which would put the spec in the vicinity of 6 in*lbs for AN3 or 12 in*lbs for AN4 in excess of any running torque. Since it is not at all easy to measure such low values with any accuracy, one good way to get "close enough" is to calibrate the clutch on your electric screwdriver using a long extension and a bathroom scale.
Also, loctite is your friend, as long as you make sure bare metal is exposed on at least one surface.