I have recently bought an old mark 1 ferret locator off eBay and it doesn’t work properly, I got a full refund of £170 but eBay said I could keep the item. I believe it needs recalibrated... I have asked around all my hunting friends, I have asked Deben themselves with no luck... does anyone know who could fix it for me please ? Any information would be much appreciated as I’d like to put this box to use.