A little issue i came across whilst removing and cleaning indicator glass on my panda was that 3 out of the 4 screw heads were shattered (being made of plastic)
1) Remove the screws with a philips 3 srewdriver applying correct pressure to prevent further shattering.
102_0011.JPG
2) Grind down the plastic tip carefully until splinted plastic has gone
102_0016.JPG
3) Heat up the screwdriver tip with a bunsem burner until it begins to turn blueish.
102_0007.JPG
4) If you then press heated tip into plastic head it will mould and produce a grove once more.
102_0008.JPG 102_0010.JPG
If the screw head is beyolnd saving simply use a screw of same thread and size and seal with silicone to prevent rusting. (y)
102_0017.JPG
hope this helps!