import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,53))
r=w0.sketch().segment((-86,29),(-54,29)).arc((-2,-9),(51,29)).segment((83,29)).segment((83,62)).segment((51,62)).arc((-2,100),(-54,62)).segment((-86,62)).close().assemble().finalize().extrude(-107).union(w0.workplane(offset=-96/2).moveTo(80.5,-55.5).box(11,89,96))