[Healeys] rear hub extension studs

[andy pole]

Friends
Just spent a few hours pulling my hair out with my rear axle, the PO had 
chewed up most of the hub nuts on both sides when he tried to probably free 
the rear brakes. I have managed to get all of the nuts off but had to drill 
out two studs to free both drums/ hub extensions. Then had fun trying to 
prise one sides drum off its shoe.
Question is are the countersunk headed studs pressed into the hub or screwed 
and do I have enough clearance between the axle backplate and hub plate or 
do I have to remove the hub?
thanks in advance
Andy

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