my old bathtub drain got corroded so I decided to replace it. I successfully took out the old drain, but the drain pipe underneath is not even, so when I screw in the new bathtub drain there are about 4 threads remaining on the left side, so it drips water. It's a bit hard to see in the photo, but the top left side is a bit lower than the bottom right. Any suggestions on how to handle this?
UPDATE: On my fourth try I got the bathtub drain to screw in properly. I screwed it in 1 thread at a time, checking each time for skipped threads and eventually it worked. It started out slanted, but evened out in the end.