just to back u up there cen...

ive just run my .28 in on this approach, did it with my os .18 too. i did check the .18 with a gun i purchased after the .18, but ran it over before i got the .28... the readings were within the realms of sensible, but i dont trust them as much as my gut feeling.

just dont go bananas on the adjustment screws and u should be fine.

mind u, to detect engine running problems, they can certainly give u some idea of whats happening. i understand ur reluctance to say anything now cenracing... i expect some flaming now for typing that lot!