You *might* be able to get a plus on a PST lp72 tank. PST published their REEs after the fact but they made a typo and the tester may or may not accept the documentation as adequate. Its not signed or even on PST letterhead. Its an old school typewriter made photocopy of photocopy kind of thing.So that means who are getting the + are those with not a Noris tank?
Probably 90+% of lp72s don't have a plus on them at all anymore.