Originally Posted by vjp
I would try removing your freewheel by clamping the tool in a bench vise and then place the freewheel on top of the tool and turn the whole wheel to loosen it.
If you have enough purchase to do it this should work. Also, use the skewer to hold the tool in place until you break it loose. That will keep the tool in place without too much fiddling around. You might try dropping an appropriate sized washer down in the hole to raise the tool up a little bit.....
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