matt
Established Member
My familiar story ended with getting behind the bath, slackening the large plastic nut holding the waste/overflow, cutting through the whole thing (so the inside and outside parts were no longer joined), and then replacing the entire overflow, waste control and waste (which is why I was trying to get the knob off in the first place). Once the old one was out I could the grub screw was so corroded I never stood a chance.