I use a 60 grit belt and hang it over the edge between 1/16"- 1/8" with the grinder running slow/medium speed. And as Steve says in the DVD you use it like a sculpting tool freehand and gently nibble away at it. Use a rest for stability.
I don"t think putting a radius on the corner of the contact wheel would be an advantage; I would imagine that would make it difficult to keep crisp grind lines and make it impossible to sweep your grinds due to a portion of the belt being unsupported right where you need it.
And don't forget practice - lots of it.
best wishes
Steve M
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