Photo by Rick Hellman New York’s Fleshtones call it “Super Rock.” It’s a high-octane mix of ‘60s rock (the Rolling Stones and the Swingin’ Medallions sharing a pedestal) and rhythm ‘n’ blues. It has thrilled the band’s devoted cult audience since 1976. Opening with “Hitsburg” from the out-of print album Hitsburg Revisited the Fleshtones turned a quiet Sunday evening into a rock ‘n’ roll party, performing for about 90 people at Knuckleheads. Their Fabulous-Flames-meet-Paul-Revere-and-the-Raiders stage moves (part goof, all homage) unabashedly honor frat-rock traditions and old-school stagecraft. Rarely confined to the stage, the band spent much of their time in…