S. K. Grimes is still in business, even if Steve's not. They charge $15 to drill a lensboard, and if you don't have the right flange or retaining ring, they can supply one for an additional fee.

That said, I can't believe no one in SF can drill a lensboard. One of the pro shops like Gasser's should be able to advise you, if they don't do it themselves. Is Jim Galvin (of Galvin 2x3 camera fame) on the West Coast? He advertises regularly in _View Camera_ magazine and does LF machine work.