import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-14))
r=w0.sketch().arc((7,-45),(9,-41),(10,-45)).segment((10,-42)).segment((7,-42)).close().assemble().finalize().extrude(-25).union(w0.workplane(offset=-12/2).moveTo(42.5,-12.5).box(15,21,12)).union(w0.workplane(offset=53/2).moveTo(-31,26).cylinder(53,19))