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Remove two screws at the bottom of the left-hand housing.
Take the left crank off by taking off the 'endcap' over the screw/bolt that holds it on, etc.
There's a screw through the crank that attaches it to other parts inside, the 'axle' as it were. It is center-mounted. The screw is under a cap, that you have to pry out first.
The 'axle' seems to have two ends (looking at the diagrams I have) that maybe, perhaps, screw into the cranks. Grasp one crank, and unscrew the other, perhaps??
Aside from what I've explained, I don't know of any way.
Perhaps removing the crank on the other side of the housing might help? or holding onto the unremoved crank to give you leverage to unscrew the other one?
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Hi you need a special tool called a crank puller. You can buy one from any store that sells bicycles. If you go to an actual bike shop they will most likely show you how to do it, or possibly you could bring your bike to them and i bet they would let you borrow it to save the $20 bucks..
It threads into the outer threads where that plastic cap was held on, then pulls the crank arm off. It is a tapered square shaft so it is held on very tightly.