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  1. Itchy-Position2591 on

    Yes you should put that extension aside as it won’t fit through the square taper of the crank arm

  2. Yes, once you take it out you can see that the extractor wouldn’t get past the crank.

    Source: I recently did this, wondered why the crank wasn’t moving until my lizard brain worked out that the only thing I want going to achieve would be stripping the threads from the crank with that in there

  3. If it doesn’t fit in that hole, then yes. Different cranks have different sizes and it may or may not need to come off.

  4. Yep. As it is, it’s for octalink cranks, which have a round hole, and since the axle is hollow they need to push against the edges of the axle. On a square interface that won’t fit, and you run the risk of damaging (but minor damage) to the sides of the square interface. 

  5. That nub is for isis cranks that have a larger spindle. You have a square tapered crank.

    remove the nub.

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