This article is from 2012, I wonder why it's making the rounds again. It's really not about restoring a Fuzztone, it's about restoring a bass that happens to have the Fuzztone installed.
Any competent pedal guy could restore the EB-0F circuit. Gibson sold only 265 EB-0F over four years. They must have sold tens of thousands of Maestro FZ-1 pedals with the same circuit.