So I have put hardibacker on the walls around the tub and on one of the three walls the wall is not flush with the tub flange (See pic below). Not sure how to make the wall a bit thicker to go over the tub.
How to build up the hardibacker if it doesn’t come flush with the tub
bathroombathtubcement-board
Related Solutions
Will it be used as a shower as well? If so, sheetrock is the wrong material for the surround. It's going to act as a sponge if water ever finds its way to it.
What you could do is put backer board on top of the sheetrock, then coat the backer board with a waterproof membrane (I like the Redgard product for that) then tile. Be sure that the backer overlaps the lip of the tub to the inside.
Personally, I'd pull out the sheetrock completely, then shim out the studs and apply the backerboard to that.
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.
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Best Answer
If possible I would take down the hardibacker and furr out the studs the 1/4" or so. Even with tile over it the possibility of water getting behind the tub is high and it defeats the purpose of the flange.