Rubber sole molds.
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Previously:
https://www.homemadetools.net/forum/...608#post189801
https://www.homemadetools.net/forum/...734#post182955
https://www.homemadetools.net/forum/...921#post133676
https://www.homemadetools.net/forum/...146#post180385
https://www.homemadetools.net/forum/...152#post115730