GTX 470 screw problem

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Hello again...
I have a bit trouble with GTX 470 which was bought as overheating, came with cooler deatached and a lot of thermal paste on cooler and off the gpu die...
I was unscrewing backplate but the guy who sold me ruined most of screws but one seems like totally ruined without any threads.
I managed to drill two lines to unscrew (on screw head) but they broke.
Now my question is, should I with drill remove screw head?

Also Ive got it for dirt cheap 15$...
I wanna do the delid on gpu die as it is possible, sand the die also and sand the contact between die and heatsink.
And yes it works stable undervolted 975mV at stock.
 
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