As always, it's customary and helpful to state the model and year of the BSA you're inquiring about, Goldy.
Thankfully, all A7s and A10s were fitted with the same Rocker Oil Feed Pipe Banjo Screw, P/N 67-317, which has a 3/64-inch radial hole for both inlet and exhaust rockers. This hole size is quite adequate to lubricate the rockers.
If the screw has a 3/32-inch radial hole, it is intended for the exhaust rocker on Gold Star and probably other BSA singles.
David