hi
id go for the blow lamp on ali around stud,shouldnt need to be massively hot to move stud,as for blind bearing,same again,heat outside of casing around bearing,keep moving blow lamp around to get even spread of heat,when hot a good tap with a mallet should dislodge it,i have done this with an oxy acetelyne torch and never melted casings,just keep moving flame it will be o.k.