Planet X Model B Freehub Spares

My freehub died on the way home tonight. I've just stripped it down and the spring that wraps around the pawls has snapped. Looking at the Planet X website, they don't list spares or even a replacement freehub for the old model b's (shimano fit). Obviously I'll give them a call in the morning, but in the meantime, does anyone know where I might source a replacement spring? Sure I read somewhere once that the hubs are novatec?


thanks

Steve