import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,41,0))
r=w0.sketch().circle(50).reset().face(w0.sketch().segment((-10,-1),(7,8)).arc((-5,9),(-10,-1)).assemble(),mode='s').reset().face(w0.sketch().arc((-7,-8),(5,-9),(10,1)).close().assemble(),mode='s').finalize().extrude(-83)