Yanno I didn’t mention this earlier but I hotglued a small magnet to the underside of each ice cube hole to ensure the screws stay put. I know it seems kinda overkill but even with the tray, I’ve (well my nosey cat at the time too) managed on multiple occasions to knock or turn over the tray and in the process lose/misplace a screw. Pill boxes work well but then you’re limited to 7 steps per pill box.
Anyhow, magnetizing the tray has eliminated this risk for me as everything stays in the tray if it’s accidentally knocked.
Nice work @RhianB , a magnetic mat also works well.
In a pinch I have used strips of single sided tape on a sheet of paper, sticky side up and taped down with short strips crossing over the ends and in the middle. Place the screws head first on the tape and they stay put.
I came up with a sequence technique that works for me, where I remove screws in a clockwise order, typically starting top left corner if possible and then keep them in that order to be reassembled in reverse.