Bob, I have successfully made one before, but you will need another Buick AFB carb to get the ball stud off the arm. You will also need an original for a pattern. You can then cut out the sheetmetal piece from some of the metal on the donor arm, make the rivet on a lathe, then install the ball stud. You have to grind the brad off the back of the ball stud to remove from the donor, then you can put a quick ball of weld on the back to hold it once it is in the new arm.