Just for information, a way to get into the spine shoulder and grind area.
"A Cup Wheel on a Dremel "
It does not cut fast with grey crayon but will go to th bottom of corrosion if necessary.
I found it, at low speed, to be perfect for cleaning the Lindley stubtail. It gently topped the re-gring lines of long ago and got the scratches out of the spine/shoulder/grind area.
Here is a razor from 2do box as an example. I now know that that razor will be a long sanding job as some pits are deep.
JMO, YMMV
~Richard