import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-28))
w1=cq.Workplane('XY',origin=(0,0,-20))
r=w0.sketch().segment((-50,16),(-26,16)).segment((-26,14)).segment((-33,14)).segment((-33,15)).arc((-12,-12),(-9,22)).segment((-9,28)).segment((-50,28)).close().assemble().finalize().extrude(33).union(w1.workplane(offset=48/2).moveTo(26,-4).cylinder(48,24))