Furutsun

Hi all, I have a Ford Fiesta mk6. I have just noticed that my driver side rear wheel camber is a few degrees negative, this is causing slight wear on the inside of the tire. Now the mk6 has a solid rear axle with drum brakes. Therefore is there anything that can be done to adjust the wheel? I have found that they do shims to re-align the wheel hub, but I'm rather dubious of the idea. Can WIM do anything? Thanks for reading.