Thank you for the replies. I have not found anything in the internet, as if no one has ever had this problem before! But I think it must be common as these 8 screws are tinny and must be normal for the holes to slack after years of use. It is true that I don't use the camera much anymore but I would like to sell it and I want to be sure it is in good working order before I do that.
I live in Singapore now. Any ideas where, who could do this kind of job around here?
I'm sure you'll find a waiter in Raffles who can help you with an address! Always ask a local.