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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,20))
r=w0.sketch().push([(0,-28)]).circle(72).reset().face(w0.sketch().arc((-33,-46),(0,-65),(33,-46)).close().assemble(),mode='s').reset().face(w0.sketch().segment((-33,-9),(33,-9)).arc((0,10),(-33,-9)).assemble(),mode='s').reset().face(w0.sketch().arc((27,72),(43,74),(58,72)).segment((58,100)).segment((27,100)).close().assemble()).finalize().extrude(-40)