Fixing old cameras

I bought bunch of old cameras for peanuts. I was not really sure why at the time. Let's say they are backup of my current cameras, if/when they brake. Also I wanted a camera for summer, to fit in my shorts pocket. My Konica C35 doesn't fit that description - it fits in the jacket pocket fine, but for short or pants it is too big and too heavy. So one of bought cameras is Olympus XA1, the simplest…