> Buy a 100 of them and keep them with the discs. Of course! My only concern is that plastic parts often start getting brittle after 35 years or so and might s

> Buy a 100 of them and keep them with the discs. Of course! My only concern is that plastic parts often start getting brittle after 35 years or so and might simply not survive. In the meantime I found an alternative a solution: there exist consumer-grade 3D printers with 50um precision - hooking up a camera with a microscope in place of the nozzle should be enough to produce pictures of e.g. 100um x 100um tiles and stitching them together to get an image of the whole disc.