Tub drain center hole too big for strainer screw
Hi all. I bought a fancy, "universal" shower drain strainer for my boyfriend's bathtub (which had no strainer). It came with a 1-3/4"-long screw, about 11/64" in diameter (I don't know anything about screw sizes so I held it side-by-side with some drill bits we had and it was the closest match :o ) Anyway, the strainer itself fit perfectly over the drain, but the center hole inside the drain is about twice the diameter of this screw! I'd like to keep the strainer but would also like to screw it securely in place. What do you think I should do in this case?
Thanks in advance for your time and help. :D