What's the trick to disassembling an older Brut second stage ??

[Mark IV]

I know these things are supposedly stupid-simple (no jokes, please ) , but these things are giving me fits.
I have what's almost a new-old-stock 2nd that I'd like to do a fresh service on, as well as a crusty old yellow octo I've had for many years ( and that really needs a service). These are both older (90's era) models, not the newer ones with the oval-shaped front.
I removed the hose, and the purge cover and diaphram, and the next threaded section that exposes the seat. Now what? Do I just start unscrewing that tiny screw at the base of the purge lever? I'd hoped to "practice" on the old yellow 2nd stage, but i can't even get that piece off that exposes the seat (which may be a corrosion issue, but didn't think it was that bad).
Any help, warnings, links, points in the right direction, etc. would all be highly appreciated.....

 

[KeithG]

the service manuals are available on frogkick
http://www.frogkick.dk/manuals/sherwood/

 

[Mark IV]

Thanks man, the manual link has been very helpful!

 

[Jim Lapenta]

A 3/4 inch deepwell slotted socket makes servicing the Sherwood 2nd stages much easier. I made one using the Bridegport and an end mill at work.