Self-extracting crank bolts

i have just tied to take off some strongshite cranks with self-extracting bolts, and BOTH of the black washer things have shat themselves, ruining the thread on the ds crank.
what the fuck is going on?

supremely fucking cunted off.

This has happened to me on every (new type) stronglight crank I've ever used.
They're self extracting plastic shitness knows no boundaries.
They should be burned and their ashes pissed on.
fucking useless design.

I know use Miche.