Steve, when I repalced the leadouts in my Noblarf, I did it like this, it was easy.....
install new leadouts on the new bellcrank, (I guess this is already done?)
access the bellcrank in the airplane, and remove it a tiny bit. enough to snip the old leadout wire......
....and glue the old wire to the new leadout wire. Make sure the bellcrank is correctly orientated to the wing. (I used CA on the leadout butt-splice, I am guessing you will have to pull the wire thru leadout guide.)
Gently pull the new leadouts thru the wing.
install new crank and push rod
terminate the new leadouts
fly airplane
easy
You can always use music wire to pull wire thru also.
later man
Greg
I hope this helps