import cadquery as cq
w0=cq.Workplane('YZ',origin=(16,0,0))
r=w0.sketch().segment((-50,-12),(-30,-12)).segment((-30,-37)).segment((-28,-37)).segment((-28,-12)).segment((-11,-12)).segment((-11,-6)).segment((-28,-6)).segment((-28,15)).segment((-30,15)).segment((-30,-6)).segment((-50,-6)).close().assemble().finalize().extrude(-33).union(w0.sketch().push([(-31,-9)]).circle(14).push([(24,11)]).circle(26).finalize().extrude(-29))