import cadquery as cq
w0=cq.Workplane('YZ',origin=(-12,0,0))
r=w0.sketch().segment((-50,-3),(-18,-9)).segment((-36,-31)).segment((-24,-31)).segment((-24,-36)).segment((-31,-36)).segment((-23,-42)).segment((1,-12)).segment((46,-20)).segment((50,3)).segment((18,9)).segment((36,31)).segment((23,42)).segment((-1,12)).segment((-46,20)).close().assemble().finalize().extrude(-17).union(w0.workplane(offset=41/2).cylinder(41,12))