Part of the problem (I think) is that as part of getting the frown in the first place the middle section of the spine was quite a lot flatter than the toe or heel sections but now that the edge was straight there was not a consistent correspondence between the spine and the edge when the razor was flat on the hone. I would love to know what the experts do with this.
If the spine is unevenly worn, then that too needs to be addressed. I don't know what others do, but I do "side honing" on just the spine. I tape the edge and hone back and forth in the direction of the length of the spine until it is flat.
If the spine is unevenly worn, then that too needs to be addressed. I don't know what others do, but I do "side honing" on just the spine. I tape the edge and hone back and forth in the direction of the length of the spine until it is flat.
This makes sense. As the entire edge is now as short as the "low point" of the previous frown, the whole spine should also be as flat as the bit that corresponded to that same "low point".