import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-23))
r=w0.sketch().segment((-35,-50),(-27,-50)).segment((-27,-22)).arc((-31,-23),(-35,-22)).close().assemble().finalize().extrude(36).union(w0.workplane(offset=46/2).moveTo(9,39).box(52,22,46))