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I use 1" thick blanket, about 2 layers thick so I think you have more than enough. Just be sure to have the ends closed up.

The ceramic wool blanket works well, thats what I use inside an old metal tool box.

If I manage to forge harden my blade then I always anneal it again before drilling the pivot hole.

Either drill your pivot hole right after the anneal or after the second anneal.

My grinders...