The kickstarter project ended with a phenomenal $328,736 pulled in!
Talked with the lead and they are getting a great start on the restoration.

The thing is we are no closer to finding the answer about the dampeners than when I first posted!!
I suggested and he agreed the answer must be in England somewhere, and need to open every hangar door to find it!
(he already found 2 original radomes in UK too)

Anyone have some leads to pursue??

3 weeks and we are not any closer to finding the answer!

This is becoming a major challenge to find something!

To nit-pick on a possibly relevant point, that’s an Australian-built and -operated example, isn’t it?

True but still based on RAF design by looks. Thanks for pointing it out anyway.

I realise it isn’t the type you are looking for but, just in case you wanted a better view of the Douglas dampener than my earlier weak attempt, there are a couple of pics very near the bottom of this page –

http://www.ramsburyatwar.com/Ramsbury_Airfield.htm

Welcome non-the-less! An over looked part of aircraft and mission!

there is image here that seems to show them.

http://www.americanairmuseum.com/media/4826

and this
http://www.charleston.af.mil/shared/media/photodb/photos/020930-O-9999G-009.jpg

Thanks for links! Helps!

More info for tread:
Greyman heard them referred to as ‘Barbed’ or ‘Christmas Tree’ exhausts.

and on Sterling