You need to use a jewellers eye piece or a strong magnifying glass to look at them close up.
Info taken from mercedes-190.co.uk
Roughly what you see with an eye and a magnifying glass :-
Lets get a bit more light on that :-
A bit of photoshopping to bring out the detail.
And the money shot !!
All you need to repair one is a soldering iron, heat it up fully until its all liquid and then let it cool slowly. I tend to remove some of the solder and redo it with new solder but thats not really needed.
thanx mate i can see what you mean as the pictures are clear and close up,i got it done yesterday and found it was the stalk in the end...but thank you for the imfo will keep it in mind.