It’s a small plastic one like you would use to hang a poster or calendar. Sink drain
Plumbing – I dropped a thumb tack down the drain, should I be worried
bathroomplumbing
Related Solutions
Here's a diagram of the drain:
It looks to me like you've unscrewed the nut, but not the flange (which is a separate piece that screws to the inside of the tailpiece, while the nut screws to the outside of the tailpiece).
If things are not loosening easily, you can try some penetrating oil or WD-40 and letting it sit for a while, it may help if there is any rust or corrosion on the threads. The place this would cause a problem if anywhere would be on the outside at the top of the tailpipe.
905.2 Grade.
All vent and branch vent pipes shall be so graded and connected as to drain back to the drainage pipe by gravity.
This might prevent you from doing what you want, since your lower horizontal connection would have to slope toward the stack. Not sure if this is allowed or not, but it might be something to look into.
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Best Answer
I can't imagine it doing any harm and it's not worth the effort to remove the trap to try and find it as it probably has already passed the trap and is in the sewer. If you like to fish, you could fasten a magnet to a piece of string and lower in into the drain and try to snag the tack. Just don't lose the magnet down there. You could also remove the trap but that can be messy and why take it apart if it's not leaking.