Hi,

I have found that there is a little spring which pull the heads together. What happens is it gets stretched out a bit.

The tension can be adjusted to compensate by hooking the spring to a different mounting point (there are several). If you look carefully at the back of the heads, you will see what I mean (the spring is black, so it blends in very well). You might have to pull them apart a little.

I don't think the copper thing is the problem; it's just a hinge as far as I can tell.

c