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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-9))
r=w0.workplane(offset=-73/2).moveTo(-5,-9).cylinder(73,9).union(w0.sketch().segment((-100,-1),(-99,-2)).arc((-96,-9),(-87,-10)).segment((-86,-11)).segment((-86,-9)).arc((-83,-7),(-82,-4)).segment((-81,-3)).segment((-81,-2)).arc((-85,5),(-94,6)).segment((-94,7)).segment((-95,6)).arc((-98,3),(-99,0)).close().assemble().push([(75.5,16.5)]).rect(49,3).finalize().extrude(92))