I bought a new throttle lever assembly for my carb since the old stud broke off the old one. I'm trying to figure out the size of the nut that holds the throttle cable to the stud. It's part No. 3302-810928. I've tried 1/4-20, 10-24, and 10-32. Is it a #12? M5 maybe? Or is it a "special" nut I have to order?