Screws mother fell in the control chain shaft!

Hello, I wanted to solve another problem of my GPX 600 R (Bj 1988) today and have now created one. I removed the valve cover and then a mother fell in. First the mother is still visible and I tried to pull her out by mangnet in connection with a thin rod which unfortunately did not clap. Now the mother seems to have fallen further in and is now not visible from above. She fell down in the middle of the control chain. How do I get the mother out now? Vll this has happened to someone here already and has a fast possibility perrat?