I'm changing the drivechain on a friend's bike. All's going well except for the freewheel replacement bit. I've tried unscrewing it with the proper tool and a big spanner with plenty of leverage. However, nothing's giving and all I seem to be doing is distorting the removal tool (see photo).
Any ideas? Maybe it'll never come off and he'll need to cough up for a new wheel? Dunno. Help??