Duster Roof skin replacement..need help with drip rails

Guys,

I have searched and searched and wasn't able to find anything. I have started on replacing my roof skin on my 73 duster.

My question is, how are you guys drilling out the spot welds between the drip rail and roof? Not much room to work with. Can i get it with a normal spot weld bit?

Any help would be great! Thanks!