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import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-23,0))
r=w0.workplane(offset=-77/2).moveTo(-58,-51).cylinder(77,26).union(w0.sketch().segment((-48,13),(-36,13)).arc((18,-33),(73,13)).segment((84,13)).segment((84,31)).segment((73,31)).arc((18,77),(-36,31)).segment((-48,31)).close().assemble().finalize().extrude(123))