import cadquery as cq
w0=cq.Workplane('YZ',origin=(22,0,0))
r=w0.sketch().segment((-50,-28),(-49,-28)).arc((-46,-27),(-50,-27)).close().assemble().finalize().extrude(-45).union(w0.workplane(offset=-30/2).moveTo(48,27).cylinder(30,2))