Thanks Guys, appreciate it.
Yes there is a fellow in NZ who has done this who I have been chatting with and is very helpful. But as he did it years ago and some of the details I need to know about are a bit lost in time. But the good news is he has done it, and it's been trouble free for years now.
I wonder why more others have not done it. He said the OD does fit in the tunnel
Images are here (if this link works, thanks for the tip)
https://www.tm-img.com/pleask
