import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-36))
r=w0.sketch().arc((-50,-38),(-42,-36),(-34,-36)).segment((-39,-20)).segment((46,8)).segment((50,-4)).segment((50,39)).segment((0,39)).segment((-11,48)).segment((-19,39)).segment((-50,39)).close().assemble().finalize().extrude(45).union(w0.sketch().segment((-49,9),(16,9)).segment((16,37)).segment((-34,37)).arc((44,-24),(-49,9)).assemble().finalize().extrude(72))