import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-3,0))
r=w0.sketch().segment((-22,-25),(-7,-25)).arc((-3,-39),(2,-25)).segment((50,-25)).segment((50,39)).segment((-22,39)).close().assemble().reset().face(w0.sketch().segment((-6,-30),(-1,-35)).segment((1,-33)).segment((-4,-29)).close().assemble(),mode='s').finalize().extrude(-23).union(w0.workplane(offset=30/2).moveTo(-49,-2).box(2,18,30))