import cadquery as cq
w0=cq.Workplane('YZ',origin=(42,0,0))
r=w0.sketch().segment((-50,-49),(15,-49)).segment((15,-6)).arc((48,32),(-2,36)).segment((-50,36)).close().assemble().push([(-10,21)]).rect(38,30,mode='s').finalize().extrude(-84)