Good luck finding such info on a recent solid state radio. Make sure it's not a mechanical problem with the dial before you start fiddling with the adjustments. If it is previously unmolested and not a mechanical problem - there would likely be a failed or failing component causing the problem - and that would have to be addressed for a permanent cure. If it is an alignment issue - you can find some general hints here:http://www.vintage-radio.com/repair-restore-information/transistor_alignment.html
Be mindful of the spring - uncontrolled release could injure you and/or ruin the radio.
Those, I believe, were also known under the name "Freeplay" and, at one time, had some association with Coleman (the lantern people) in the US. Maybe you could get some info from Coleman. I have one that is AM/FM - yours was intended for the isolated regions of the world (ie., Africa) - though some of the SW versions made it to the US market. I remember seeing a few of that model at the discounter "Tuesday Morning" many years ago....... More info:.....http://en.wikipedia.org/wiki/Freeplay_Energy