Jim Diamond, the producer most responsible for the gritty Detroit garage-punk sound -- the Jack Endino of the Motor City -- has had a rough week. Nasty threatening letter shows up on his door. Then the guy he suspects of sending it -- the White Stripe he happened to be suing -- beats him in court. ("I can tell you this much," says someone In the Know, "Jack White is not popular in Detroit.") Between court appearances, though, Diamond was running back and forth to the studio, where he was hard at work on the new CD by Boston's own the Charms (see above). Little Steven's favorite Hub garage band were holed up with members of the Sights, the Romantics (yes, THOSE Romantics) and the Esperantos, all of whom appear on the new disc. The Charms will be back in town June 30 at T.T.'s; look for the new disc later this year.