import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,1,0))
w1=cq.Workplane('XY',origin=(0,0,-27))
r=w0.workplane(offset=-30/2).moveTo(8,30).cylinder(30,20).union(w0.sketch().segment((-24,-33),(-23,-33)).segment((-23,-25)).arc((-21,-23),(-23,-21)).segment((-23,-12)).segment((-24,-12)).segment((-24,-21)).arc((-25,-23),(-24,-25)).close().assemble().finalize().extrude(-13)).union(w0.workplane(offset=33/2).moveTo(-23,-23).cylinder(33,5)).union(w1.sketch().push([(-39,-23)]).circle(11).circle(2,mode='s').finalize().extrude(40))