import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-23))
r=w0.sketch().rect(54,150).push([(-4,50.5)]).rect(14,23,mode='s').finalize().extrude(-77).union(w0.sketch().arc((-73,-56),(-43,-69),(-23,-95)).segment((73,-95)).segment((73,95)).segment((-73,95)).close().assemble().circle(65,mode='s').circle(64).finalize().extrude(123))