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or a regular rasp.
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You want it rounded and tapered smaller in the back than the front.
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Using a sanding disk as a pattern draw a circle on a piece of foam pad from a back packer's sleeping pad or something similar.
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and cut it out.
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Glue it to the wood disk with hot glue.
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Mark off the sides of the Velcro strip
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and glue it in place with hot glue.
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