Help! Wiper pivot stud broken

Or, If the remains of the broken stud is still usable, and If the hole in the wiper pivot post can be drilled to 7/16, 3/8 would be minimum... Lets go to the lathe. 1/4-20 threads full to 3/8 deep inside a piece of round stock about 1.375 long. Other end turned down and threaded 1/4-20 X .750 and we've created a stud extension. The larger diameter could extend through the now larger hole in the pivot post with washers over it so the nut tightens the pivot post in place properly.
I don't imagine this slightly longer stud interfering with wiper pivot movement but I would need to double check that. Maybe a full 3/4 of 1/4-20 threads isn't needed. Actually only full nut is req'd.