import cadquery as cq
w0=cq.Workplane('YZ',origin=(13,0,0))
r=w0.workplane(offset=-25/2).moveTo(-25.5,-31.5).box(1,13,25).union(w0.sketch().arc((21,42),(-3,11),(37,10)).arc((48,35),(21,42)).assemble().finalize().extrude(-11)).union(w0.workplane(offset=-9/2).moveTo(-25,-21).cylinder(9,25))