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Some flat spring steel strip.
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It was a little too wide so I grabbed it in my handy Vise Grip Sheet Metal pliers and ground it down.
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I also ground the tapers on the ends.
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There was much cursing involved so I have no pictures of the forming, but basically I bent it into a rough circle then formed it in this hole with a tapered punch.
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Even so it was a little too springy so it got bent a little more. The round nose pliers were my weapon of choice.
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I had a hard time getting 1/4" thick leather but finally salvaged some from an old leather drive belt. I punched the disc oversize.
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I punched the center hole and mounted it temporarily, then sanded it down to size. Then I sanded the ends to get the proper thickness.
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The finished plunger leather.
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Mounted, and you can see how the expander pushes it out at the bottom edge. I need to put a new felt ring on.
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