I accidentally lost a small screw into my sink. This screw is a special screw for a toilet paper holder and cannot be replaced easily.
The sink has this L-shaped tubing with a large bottom part in it. I think it’s called a bottle trap (see picture 1). I was thinking that I could unscrew the connector nuts and get the small screw from he bottle trap. Is that feasible and if so what precautions should I take to protect the tubing and bottle trap?