import cadquery as cq
w0=cq.Workplane('YZ',origin=(-21,0,0))
r=w0.workplane(offset=12/2).moveTo(43,-77).cylinder(12,23).union(w0.sketch().arc((-12,-59),(33,-59),(65,-26)).arc((-31,94),(-12,-59)).assemble().finalize().extrude(43))