The "new bushing" is a:
Gardner Bender Steel Crimp Connector, 18-10AWG
(you can also get them in Copper)
I am not sure of the size I used. It would probably be for 12-14 guage romex. They are cheap, so you could buy a couple of sizes to have on hand when you have the Throttle Shaft out of the carb body.
Here is a link to Home Depot where I bought it:
http://www.homedepot.com/Electrical-...atalogId=10053
Now you are equipped to fix your carb if the Throttle Shaft Bushing (upper) is worn out.