I met a guy in Auckland a year or so back called Peter de Waal. Peter had written an article on how to repair light seals. Here is the link:
http://photo.net/classic-cameras-forum/00SVtt

My father is 85 and quite disabled. I have been sending him old cameras I have picked up and he has been following this process with good success. It is a bit fiddly and time consuming but you can't damage the backs and will probably have some fun while having a go

Cheers