hi,i have taken a 110v transformer out of an electrical appliance that is from the usa but i want to change it for one to take uk mains 240v.i used a 110v power supply to test the old 110v transformer and used a multimeter and it said that the output was 31v.so i need to find a transfomer that takes 240v with an output of 31v,and the appliance itself only requires 40ma.Problem being though is size! i cannot find one anywhere small enough to be a replacement.the old transformer is 37mm wide,30mm in height and 31mm in depth with mounting holes(chassis type) center to center 45mm apart.does anyone know of a suitable replacement from anywhere? the original is pictured below=a