Dr Sprocket talks Crocker: from working man's tool to rich man's toy; Denis Babin's '47 Knucklehead; Factory Metal Works' '64 'MQQN' Triumph; Walter Gemeinhardt's race- ready 45; The Black Sun rises... Markus's stunning '46 Knuck (cover image); Oiyama's hot-rod WLD; Tamiami Tyrants' street-fightin' Knucklehead; Pete Stansfield's beautiful Norton Gold Star