import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,50))
r=w0.sketch().arc((-9,19),(-2,12),(2,2)).arc((8,-4),(2,-9)).arc((1,-15),(-2,-20)).segment((9,-19)).segment((9,20)).close().assemble().finalize().extrude(-100)