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Sand in my speaker stands... makes a dull thud... just make sure it is dry... you want lossy material...

He has a whole story that makes sense, and it starts at the way you choose steel and the size of the building blocks... which requires a larger hammer....

I have no idea... kevin cashen sez below 100 pounds can only do small billets and may not weld as quick as is ideal... google matherton forge and look at damascus section to see if it makes sense to...