A few tips when installing a new stud. After you hammer out the old stud, insert the new stud and place about four 1/2 flat washers over the stud on the outside of the hub. Next, install the lug nut backwards (flat portion facing the hub and tapered side out). If you have a good impact wrench, now use it to pull the stud into the hub. Be sure to pull it all the way in!