Day 365/22. How close can I go?

Messing around with macro on a very wet morning at the end of 2022.
This is as close as I can get. This is a russian core memory module from a 1950's computer. I acquired the board ages ago. The individual toroids are on 64 rows of 64 so the board can, in total, only hold a measly 4KB of data.
Each individual toroid is around 0.5 mm in diameter.
See extra pictures for a zoom out to full size.