You dont want to say the word 'drill' in this case
Drilling is not necessary. Pull off the rotor and You'll get a better view of the rear of the hub. Tap out the broken stud with the hammer. What's holding it in is the flared out edges from the rear. To install a new stud, buy one from the local auto parts store, shave a side of the rear of the stud and pass it in the hole from the rear....then line up the grooves and either tap it in from the rear or pull it all the way through like mentioned.