OOOoOOOOOOooOOOOOO I'm very interested in that. Been trying to figure out a better breathing alternative for my KE100. Essentially the same as a G3. That's a neat little blurb, where did you find it?
EDIT: just saw you found one of the service manuals with the (kinda rare) hipo section. Nice find! Post more info as you find it, I'm following this with great interest.