Nipples up or down or does it matter. Mines are up but having bother fitting wing stays as they are fouling flexi.

Nips up !

Steward to bleed otherwise.

think they have to be up to bleed best like a radiator not 100% sure though

Nipples stood up proud like fighter pilots thumbs.

As above unless you're prepared to take them off whenever they need bleeding?

Thanks guys.