2) 2pcs. dill bits ( 1 smaller than the cal. and the other the same as cal.)
3) vice or vicegrip
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clamp the pliers with a vice grip
make a punch on the desired location.
drill the pliers using the small drill bit.
make sure that you do not drill through. once in a while open the pliers to see your progress.
again clamp the drilled pliers.
drill the opening with the big drill bit with a depth of 1mm or more.