import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,13))
r=w0.sketch().segment((-50,1),(-49,1)).segment((-47,35)).segment((-48,35)).close().assemble().push([(-7,-29)]).circle(6).finalize().extrude(-28).union(w0.sketch().push([(-24,3)]).circle(26).circle(22,mode='s').push([(42,18)]).rect(16,8).finalize().extrude(1))