After you've drilled a hole, slightly larger than 1/4", through the center of the "crater" left by the offending stud, you can feed the bolt and washer through the filler neck using the old British Leyland wire trick. Drilling the hole slightly larger than the 1/4" bolt makes it A LOT easier to feed it through from inside the overflow tank.

Owner caption July 2013 · Photo 5 of 75