Quote Originally Posted by mr rusty View Post
I do not believe this is correct.

John Hermanson posted on apug (forum search)

Yes, every OM-1, 1N, 2, 2N I see now for overhaul need new foam at the hinge, slot and mirror areas. John, www.zuiko.com

If John says all OMs need mirror foam, they all need mirror foam!!
That does not mention the prism foam. This was foam used internally between the prism and the top cover. You cannot see it unless you remove the top cover.
As the foam ages, it turns to goo and that goo eats away at the silvering of the prism.

Yes, past a certain serial number they stopped puting foam between the prism and the top cover. I'm not sure where the cutoff date was.
But, like Schrödinger's cat, you wont really know until you look.