import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-2,0))
w1=cq.Workplane('YZ',origin=(9,0,0))
r=w0.workplane(offset=-21/2).moveTo(23,7).cylinder(21,4).union(w0.sketch().push([(-6,-29)]).circle(21).push([(0.5,-21.5)]).rect(19,1,mode='s').finalize().extrude(34)).union(w1.workplane(offset=41/2).moveTo(-28.5,1.5).box(7,35,41))