For removig the old bolt/stud, unless it broke off way down inside the case, give a try to the trick of centering a nut on the broken off bolt/stud, welding it on (nice and hot) and then wiggling back and forth to free up the offender before turning it out. There's no harm in soaking with your favourite penatrating oil/fluid for as long as you can spare before trying the weld trick. If the first nut shears off, do a second....
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