You can also look here for a parts diagram, and to purchase the on/off switch directly:
http://www.ereplacementparts.com/dewalt-dw362-type-circular-saw-parts-c-1009_2789_2808.html
David, June 2007
http://www.freewebs.com/hhmblackanddeckerdewaltservicecentre/ 01543 275048 Mail Order Service
HHM Black & Decker Service Centre, May 2007
replacement switch, try Black and decker site for retail and service shops in your area.