import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-13))
r=w0.workplane(offset=11/2).moveTo(-18,-12).cylinder(11,32).union(w0.sketch().push([(46.5,22.5)]).rect(7,43).push([(46,22)]).circle(2,mode='s').finalize().extrude(27))