I've tried the internet search seams like that's a problem with these tools .....Spares very few never what you want. Made in China I'm told with little or no spares back up. Ie: a 'Throw away tool'. Buy cheap expect no spares. Buy something with quality name and spares back up like Bosch, Makita, B&D, Dewalt. May be much more expensive but cost effective long term.
Try a retailer on line contact them find out if you can get one. Or buy another 'Cheapy' and throw away when faulty and out of warranty.
Bob UK
April 2014