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I made a short ferrite rod using your recipe. I let it dry a few days but didn't heat it or anything. It was much lighter than the commercial ferrite rod on which it was based. I put a enamelled copper wire coil on both rods and only got 18uH for the one I made versus 200uH for the commercial rod. What can I do to get a comparable inductance for my diy rods. Do I need to compress them or add other ingredients perhaps?