Bolt on my skate is still stuck.
The first screw extractor I bought was the wrong size, so I bought the 5-pack.
After much drilling and swearing, I think the bolt steel is just too hard for the bits.
I would try heat, except I don't want to melt the surrounding plastic, and besides, the holes are too rounded out to try unscrewing.
Next step? Not sure, might involve dremeling a slot so I can use a screwdriver.
Of course, it was near-perfect skating weather on Sunday (if a bit hot.)