import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,40,0))
r=w0.sketch().segment((-50,2),(-5,-46)).segment((5,-36)).arc((11,-37),(17,-36)).segment((28,-36)).segment((28,-32)).arc((50,5),(28,41)).segment((28,45)).segment((17,45)).arc((9,46),(0,45)).segment((-10,45)).segment((-10,41)).arc((-21,33),(-28,22)).close().assemble().finalize().extrude(-80)