CHerb,
Do you use the 'e-z' connector' type attachment as shown in the drawing or a ball or swivel link to make the actual connect to the throttle cable/rod?

You got me thinking some more on 'resolution' as well... Would you get more resolution with the following; At servo: shortest arm that would allow a large % of travel of servo shaft rotation ;
longest arm at butterfly which would reduce the cable /rod travel to the LEAST amount of butterfly shaft rotation ?

The existing butterfly shaft lever has about .65" of travel at the pin hole.

The engine will not shut down with the butterfly closed. The butterfly itself has a small hole in it. Is it necessary to solder that shut to totally cut air supply?

I have been known to get confused on concepts before, but I also accept changes to my thinking, once I find an explanation I can get thru my skull! My mind was a lot clearer before coming to Mx and discovering the national drink!