I attempted to use my tub drain removal wrench to remove a bath tub drain. Unfortunately the spokes of the drain broke and the drain flange cracked. Not being terribly skilled at plumbing I am now unsure of how to remove this tub drain. How do you remove a tub drain with no spokes and therefore no removal wrench?
You could try putting an expanding plug into the drain which should give you something to grab hold of with a pair of vice grips. I would replace the wing nut with a regular nut so that you have better access to the stud.