import cadquery as cq
w0=cq.Workplane('YZ',origin=(47,0,0))
r=w0.sketch().segment((49,-76),(79,-76)).arc((80,-74),(82,-76)).segment((100,-76)).segment((100,-46)).segment((67,-46)).segment((68,-47)).segment((67,-48)).segment((66,-46)).segment((49,-46)).close().assemble().finalize().extrude(-95).union(w0.workplane(offset=-49/2).moveTo(-75,69).box(50,14,49))