I acquired this reg from a friend who retired from diving. He bought it then never used it. Anyway, I see the 1st stage is a regular old Conshelf 1st. The 2nd stage appears a tad different than the old 1085's. Didn't see a parts diagram in the manuals & catalogs section. Anything special I need to know before tearing into the 2nd stage or is it just a fancy new cover? Thanks. Mark