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@ArthurFrayn
The two holes are just used to remove the self-extracting bit of the bolt, you don't need a special tool, just something pointy to stick in the holes (read a bent spoke somewhere)
Also had one of those bolts fail on my Stronglight crankset, destroying the thread on the crankarm as well. Which means the crankarm is now stuck to the BB and a crank extractor doesn't work since the thread is fucked.
I just don't understand why they would make them out of some crappy piece of weak aluminium. Definitely avoid using them if possible and just go with normal crank bolts.