Takedown Manual

I recently recieved a winchester model 42 .410 shotgun from my father (he doesn't shoot anymore), adn i absolutly love it, problem is, is that i cant figure out how to get it apart, both for cleaning and inspection purposes. The reciever, barrel, magazine, etc. are all held together in a way i've never seen before. Does anyone know where i can find a takedown manual for this gun? preferrably a free one ( and please dont just tell me a gunsmith; the gunsmith i went to told me it would cost me $50, which seems WAY overpriced for simple disassembly instructions)