Stiff Throttle

Howard Jones

Terry is correct. In order for a bell crank to work as designed the arms of the bell crank, the driving link (the cable) and the working link (double rod end thingie) should all approach each other at 90 degrees. You could shorten the back to back rod end thingie and achieve this pretty easily.
You can get cable wheels from the scrapyard. They are used on fuel injection butterfly shafts and also on cruise control. To get good ferrule alignment you can fit barrel retainers which rotate the same way that a cable barrel nipple rotates, allowing the ferrule to auto-align. Also, not all cables have slippery sleeves. You might like to try a Toyota MR2 throttle cable.