import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-5,0))
r=w0.sketch().circle(24).reset().face(w0.sketch().segment((-19,7),(-17,7)).arc((16,-9),(-15,12)).segment((-19,12)).close().assemble(),mode='s').finalize().extrude(-45).union(w0.sketch().segment((-1,-4),(-1,-3)).segment((0,-4)).arc((1,4),(-1,-4)).assemble().finalize().extrude(55))