[strongmanmike (Michael)]

Thanks Graham

I think I have seen that article before but had forgotten about it, very enlightening thanks. Seems to suggest that in my case sucking may in fact be a viable alternative to blowing after all but it is still not diffinitive..? For example it seems to suggest that if appropriate venting is available sucking is an option but doesn't explain what appropriate venting actually equates to..?

Is your fan on your Dob? Is the mirror end of your OTA closed? Are you still runnning it in suck mode?

Cheers

Mike