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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-60))
r=w0.workplane(offset=-19/2).moveTo(0,-10).cylinder(19,90).union(w0.sketch().segment((-81,65),(-74,19)).segment((-7,29)).segment((-15,81)).segment((-77,72)).arc((30,6),(-81,65)).assemble().finalize().extrude(139))