J Smith , Oct 27, 2008; 02:05 p.m.
Have you tried cleaning it with extraction naphtha or alcohol? I think you will still find some parts available because they resumed production of EOS 5 three times but they probably won't worth their price. If cleaning doesn't help you could just stick a very thin, tough rubber in there (just like in new cameras). It would make your grip a lot more comfortable and you wouldn't feel stickness anymore.