import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,41,0))
r=w0.sketch().circle(24).circle(14,mode='s').finalize().extrude(-83).union(w0.sketch().segment((-50,-15),(-23,-15)).segment((-23,-14)).segment((-21,-14)).segment((-21,-15)).segment((50,-15)).segment((50,15)).segment((-50,15)).close().assemble().rect(8,20,mode='s').push([(22,11)]).circle(1,mode='s').finalize().extrude(-47))