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Impact screwdriver... works wonders as long as you don't bung up the aluminum. As for getting the lower unit free from the powerhead: yes the shaft can really get stuck in there. Remember these simple rules: never strike aluminum with a steel hammer. Use a block of wood to dampen the blow. Try to direct the force only in the intended direction. And when you reinstall there is a small groove in the top of the shaft, an o-ring goes there, replace it!
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