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I regret to inform you that there's an entire class of jewelers who make a lot of money writing books for other jewelers, teaching other jewelers, holding seminars for other jewelers... There's more (basic) knowledge out there than customers so there's a lot of "how to make an ashtray out of PMC, $400" shit out there. The Lewton-Brain book is useful because it's basically "here's how to make a joint that moves" which comes in handier than you might think.