RPF PREMIUM MEMBER
Regarding the balance pipe (AKA crossfire tube) is the Rolls-Royce part number known? I'm actually developing something for RR right now (phone conference tomorrow at 12:30 Eastern), and if I had a part number, there is a snowball's chance I could get a print, or a line on old stock parts perhaps (very long shot there- probably scrapped due to age but you never know)
If these engines were used by USAF, there would be a NSN. That number would also help track them down.
In case anyone would like me to look into it. I know they are hard to find, and the print would not only have the dimensions, but also base material, heat treatment parameters etc. to make a correct part, rather than just a correct looking part. Maybe this has already been investigated, but if not...
You might get more eye-balls reading your request if you post in the vintage Obi thread.