A tray with compartments and grooves designed for organizing small parts and tools, commonly used for working on locks. https://media.mstdn.social/media_attachments/files/113/904/257/646/190/866/original/17957b0e4b6a49ad.jpeg
@foone I did some of this the other day (and to my surprise successfully!) but the whole time I was kinda wishing I had the digital equivalent of a lock pinning tray to put all the little screws and bobs I was trying to figure out.