Try South Bay Aviation at Torrance Municipal (Zamparini Field). For details, try
http://www.airnav.com/airport/TOA
It also happens to be the home of Robinson (the manufacturer) and there is a helo flight school there too, but the name escapes me, but could be Bravo Helicopters. Anyway, all the details, phone no's etc. are on the URL I posted.
Great place, have fun.