import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-18,0))
r=w0.sketch().segment((-50,-38),(-17,-38)).arc((8,-27),(-18,-36)).segment((-50,-36)).close().assemble().push([(-33.5,-0.5)]).rect(33,3).reset().face(w0.sketch().segment((39,44),(41,-8)).segment((50,-8)).segment((50,0)).arc((49,0),(50,1)).segment((49,44)).close().assemble()).finalize().extrude(37)