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And full disclosure - if memory serves (and that is another subject) this idea came to me from Glenn/gssixgun - and it may be part of the "tribal wisdom" as they say in some circles, i.e. "stuff we...

Another vote for the grate and puck.
The harder the soap, the finer the grater if you have the option.
Pack in layers, a mist of water helps with some (MWF) - not needed for the softer pucks like...