Quote Originally Posted by MostlyLF
One common cause of light leaks is worn out light seals in the film magazine. I've never done it, but these are apparently easily user raplaceable. Look on E-Bay for kits to do it.
Agreed. Look for seller "interslice" on ebay, he has the absolute BEST kits for the DIY light seal replacement job.

I've resealed my 3 FM series Nikon bodies, my F3, and 9 Bronica SQ backs with his kits. I've also used his seal material to improve the light sealing of a Toyo D45M and my Eastman #2 5X7 camera.