Thanks Gary, Steven and Geoff for the input.
I think the baffles do work to a degree but just how effective they are I don`t know. But I do know it affects the thermal air flow in my 6" and things don`t look good till the scope cools right down.
Actually thinking of using a heap of charcoal from the fireplace and crush it and put it through a sieve! mis it into the black paint...Sounds like a good idea anyway!
cheers Gary