allen keys? Philips? i'm not familiar with the exact bolt, but i am familiar with removing stubborn bolts. if its an allen, go to the imperial allen sizes and find a slightly bigger size, bang it in, you should be able to twist it out.
if Philips a good bit makes a huge difference. make sure u're using a no.2 bit (most screws are no.2) and hammer it in for greater contact and make sure u're ...



