import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,0,0))
r=w0.sketch().push([(-21,18.5)]).rect(58,21).reset().face(w0.sketch().segment((-4,-10),(-1,-43)).segment((14,-42)).arc((25,-44),(34,-40)).segment((50,-39)).segment((47,-6)).segment((31,-7)).arc((21,-5),(12,-9)).close().assemble()).finalize().extrude(-33).union(w0.workplane(offset=33/2).moveTo(21,27).cylinder(33,18))