Gday MickyD, I will pull one apart tmrw and have a look at it . Not sure if it is the same as yours . Sounds like the needle isn'tshutting off . Have a really good look at your seat , I know you said you have cleaned it . Shine a torch in it and really look at it . It would be good if you can put photos as you go, so be patient you will get there. Cheers.