Wheel Stud
Best not to hammer away and damage the bearing. The stud can be pressed out. As to installing, it can be drawn in using a nut and lots of washers or oversize nuts.
Here are a couple of sites about it. Putting a force behind the hub to protect the bearing is a risky approach (might damage bearing) but it's often done that way.
http://penguinhosting.net/~bigmac/st...20replacement/
http://autorepair.about.com/od/fixit..._stud_repl.htm
http://www.automotiveforums.com/t290211.html
Cutting off the broken stud helps http://www.youtube.com/watch?v=JAcMwPCI6a0
http://penguinhosting.net/~bigmac/st...20replacement/
http://autorepair.about.com/od/fixit..._stud_repl.htm
http://www.automotiveforums.com/t290211.html
Cutting off the broken stud helps http://www.youtube.com/watch?v=JAcMwPCI6a0



