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Hmmmm I have used a Norton 220 in the past but I used the side of the stone because they are quite soft and the heel would dig in, so you might try it on the side and see what happens .. Go slow take...

You have to re-contour the heel to start, otherwise you are just going to recreate the same issue..

The heel and shoulder have to be rounded and moved up an out of the way of the edge, this can be...