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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-30))
r=w0.workplane(offset=-70/2).moveTo(45,56).cylinder(70,44).union(w0.sketch().segment((-89,-46),(-51,-46)).segment((-51,-100)).segment((12,-100)).segment((12,-46)).segment((46,-46)).segment((45,-58)).segment((66,-59)).segment((69,6)).segment((49,7)).segment((48,-14)).segment((12,-14)).segment((12,40)).segment((-51,40)).segment((-51,-14)).segment((-70,-14)).arc((-77,-30),(-89,-43)).close().assemble().finalize().extrude(130))