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Thank you for all your advice and help. I did manage to do this finally. It just needed a bit of strength to push through and turn the crank tool. Works well now........

HI, yes, I actually have two types of these extractors, the one showing above and a CCP-44 type too...

It seems like the inner bolt, which is meant to press on the core thread to push the crank away does not do this.

I did all that, so many I went through, it looks so simple, unscrew, place in Crank Extractor which uses a plunge to push away the crank, yet mine does not do this.The crank dos not move. Could it be wrong crank extractor or the crank needs a very special tool?

I recently purchased a Speedbox 2 upgrade, which came with a Bosch Crank Extractor. That didn't work. I then purchased from Wiggle the CCU-44 Crank Extractor for Bosch. Again, this doesn't work either (or it's just me). How can I fit the Speedbox 2 if I can't even get the Crank off? My...