import cadquery as cq
w0=cq.Workplane('YZ',origin=(-1,0,0))
r=w0.sketch().segment((-11,-50),(13,-50)).segment((13,3)).segment((10,3)).arc((0,50),(-10,3)).segment((-11,3)).close().assemble().push([(0,25)]).circle(16,mode='s').finalize().extrude(-5).union(w0.workplane(offset=7/2).moveTo(14,-8).cylinder(7,1))