import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,28,0))
r=w0.workplane(offset=-56/2).moveTo(0,32).cylinder(56,18).union(w0.sketch().segment((-5,-26),(0,-26)).arc((5,-50),(12,-26)).arc((3,-25),(-5,-22)).close().assemble().finalize().extrude(-44))