import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-13))
r=w0.workplane(offset=3/2).moveTo(-31,-0.5).box(4,3,3).union(w0.sketch().push([(-39,6)]).circle(11).reset().face(w0.sketch().segment((-28,22),(-22,12)).segment((7,28)).segment((0,39)).close().assemble()).reset().face(w0.sketch().segment((8,-7),(12,-19)).segment((13,-19)).segment((21,-39)).segment((50,-27)).segment((45,-15)).segment((37,5)).close().assemble()).reset().face(w0.sketch().arc((25,-19),(29,-22),(33,-19)).close().assemble(),mode='s').reset().face(w0.sketch().segment((25,-15),(33,-15)).arc((29,-12),(25,-15)).assemble(),mode='s').finalize().extrude(27))