Hello, I am looking at buying a 1950s/60s Roberts Radio, but I note that it only has a two line wire (excuse the terminology) as opposed to modern day 3 line wires. Is it easy to add a modern wire to these old radios? As I would be adding the earth (I think!) lead, where is a safe place to attach it to? This would be the first time that I dabble in this sort of thing, so please tell me if you all think I might be biting off more than I could chew. Cheers!!