The sink is leaking I think the seal in the drain is damaged I am trying to unscrew the brass locknut under the strainer but it just turns and turns and will not unscrew tried turning it both ways but will not come out,Im holding the plastic strainer underneath the sink and tried turning that but nothing .Its a stainless steel sink can anyone one suggest anything .I thought of using a blowtorch and burning the plastic off underneath the sink but it could get a bit messy