Since this is a rebuild and I was trying to save the covering there wasn't clean access. However, as with most projects things change and I decided to redo the covering so now I will remove the center planking and should be able to get the pre-wired Tom Morris 4" bell crank in. I do think that if that is not clean I will use the 3" SIG nylon but add a new pushrod hole at 1/2". This should still give enough throw with good leverage and not need a 2" tall tail horn (been there done that, not pretty). Will post pic's as I get into it.
Best, DennisT