import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-6,0))
r=w0.sketch().push([(-72.5,46.5)]).rect(55,3).reset().face(w0.sketch().segment((37,-19),(60,-19)).arc((67,-39),(88,-40)).arc((39,8),(96,-30)).arc((97,-23),(95,-15)).segment((95,-9)).segment((89,-9)).arc((78,-5),(67,-9)).segment((37,-9)).close().assemble()).finalize().extrude(13)