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A checkering file. I use a file guide to get it started, once the first set of tracks is established you can move on down, registering on your file in the already established cuts. I think the size...

Here is a few pics of the full hollow I went a little too far. The difference between success and failure was leaving enough material to hand sand. Mind you this a 3rd attempt at full hollow this...

What’s the difference for you between grinding a wedge and a more hollowed razor? I find the larger wheels are harder to “find the groove”, and as I drop down into the smaller wheels it gets easier...