The tubes in Don Hutchinson's picture are what I was babbling about in my post, as a way to keep the cables on the bellcrank.

Tim,
That's a nice big photo, I don't know how you did that?
As you mentioned, I do think the "tube" method is the way to go, especially if they had a bit of spring tension towards the center. Simple yet reliable. Plus, the tubes could be changed for servicing if they showed wear.
Don has it nailed! Kudos Don!! I will model mine after your work.
Only change I would consider, although it may not be necessary, is the depth of the grove the cable lies in. Not even sure that matters?
I think about my idea of turned up ends, and now think I wasn't thinking

Sorry you had to read all that.
It's been a great Thread for me, I'm delighted with all the advise and replies. I'm on track!!
Thank you all!
Charles