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Nah, don't drill them out, just take a sharp SMALL chisel and a hammer. Get a groove, on the edge, going in the remains of the "break away bolt" and work it out with the chisel and hammer (counterclockwise to remove). Once you get it moving it's a piece of cake. To reinstall just get another groove so you can tap it back tight in the clockwise direction.
Once you get one side loose (about half a revolution) it's easy from there on out.You can also grind a slot in the left over part and use a regular screwdriver, but I found that the chisel and hammer method works best. It's pretty quick once you get it moving and you can spin the remains the rest of the way out with your fingertips.
No power required other than a little muscle. It does not take a lot of power at all.
regards
Mech
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