import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-3))
r=w0.sketch().arc((-3,5),(26,23),(-3,41)).arc((-49,24),(-3,5)).assemble().push([(38.5,-21)]).rect(21,32).finalize().extrude(5).union(w0.sketch().segment((-7,-50),(-2,-50)).segment((-2,-36)).arc((8,-27),(-2,-18)).segment((-2,-8)).segment((-7,-8)).segment((-7,-20)).arc((-10,-27),(-7,-34)).close().assemble().finalize().extrude(6))