import cadquery as cq
w0=cq.Workplane('YZ',origin=(12,0,0))
r=w0.sketch().segment((-50,15),(-2,15)).segment((-2,26)).segment((-4,26)).segment((-4,35)).segment((-24,35)).segment((-24,26)).segment((-50,26)).close().assemble().reset().face(w0.sketch().segment((-17,26),(-12,26)).arc((-14,32),(-17,26)).assemble(),mode='s').reset().face(w0.sketch().segment((-11,26),(-10,26)).segment((-11,27)).close().assemble(),mode='s').finalize().extrude(-25).union(w0.sketch().arc((9,10),(-25,-22),(21,-14)).segment((23,-14)).arc((31,-1),(40,-14)).segment((50,-14)).segment((50,16)).segment((9,16)).close().assemble().push([(18,14)]).circle(1,mode='s').finalize().extrude(-12))