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  1. that could be a phil wood bottom bracket. the spline shape and chamfer looks [extremely similar](https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/2000×1504/c2f04f30_244f_454c_a099_abc849051030_359f3cb599d04e47fb4c6c9042081e7cae9b8c35.jpeg)

    but I know no one that has [the tool](https://philwood.com/collections/square-taper-bottom-brackets/products/pro-shop-bottom-bracket-installation-tool) and could confirm that the size is smaller than a standard ISIS tool

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