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It also helps if you brace the spine against 2 nails as you sand (versus trying to hold the blade still).

Also, if the 'pencil rubber' is too small, I use a piece of rubber tubing to wrap the sand...

Neale,

I admire your will to keep at it!

I would have tapped out long ago.
Something that I found helped was to add a little mineral oil when hand sanding. It goes a little faster with the...