I've found this problem number of times, you don't need to drill anything, and it's best not to as the material the carb is made from is very soft and accurate drilling is not esay on something difficult to hold like a carb is, each of the screws is accessible with a small pair of locking pliers, with the exception of one, which is flanked by two small 'ears', carefully cut these away, and you'll get your locking pliers on to it.
As the screws themselves are - as you've already found - quite soft, the heads will narrow into a shape easy to hold under quite moderate pressure from the pliers.
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If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing.
"a deathless anthem of nuclear-strength romantic angst"
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