Originally Posted by
robertj298
Originally Posted by
UKFan4Sure
I've owned several bikes with the scalloped headset nuts. I've never purchased the tool. And I've never buggered them up either. Where there is a will, there's a way.

+1 and I do have multiple same headsets as UKFan4Sure and do use standard headset wrench's -fit and work perfect.
No need for special Shimano wrench.
But please DON'T be tempted by using a slip joint / Channelock plier.