import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,50))
r=w0.sketch().segment((-15,3),(-9,-2)).segment((-9,-9)).arc((-7,-9),(-4,-7)).segment((8,-19)).segment((15,-11)).segment((3,0)).arc((6,10),(4,19)).close().assemble().finalize().extrude(-100)