Replying to Blades are screwed

ok, so i have a pair of Salomon blades (St Pro UFS Street (07's i think?)) just to screw around with on PVC rails and junk. i wanted to take the two center wheels out on each blade so that it wouldnt be as easy to catch your wheels (I got tired of smacking my face on the ground). i got three of them out, but then the fourth one wouldnt budge. so eventually the allen screws got stripped out and now im screwed.

I think the wheel might be overtightened, its not spinning. I really want that wheel out.
help please?