import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,4,0))
r=w0.sketch().segment((-50,-21),(-43,-21)).arc((-20,-34),(3,-21)).segment((10,-21)).segment((10,-6)).segment((50,-6)).segment((50,34)).segment((-1,34)).segment((-1,13)).arc((-23,20),(-43,8)).segment((-50,8)).close().assemble().push([(13,17.5)]).rect(22,9,mode='s').finalize().extrude(-8)