Perfect straight or curved grind line before hand sand?

[David Sharp]

I'd also say that increasing the speed you swipe the blade across the belt can help. Try swiping a bit faster with a bit less pressure. It's the same concept of trying to draw a straight line incredibly slowly vs a quick swipe. The slowly drawn line usually has quite a few wiggles compared to a smooth line drawn quickly.

David, thanks for your analogy. I can't flat grind to save my life; I'm going to give this a try.