First thing: decide on a hierarchy – by function, by size, by material. Then give each a code, like M01‑001 for a micro‑gear, with a two‑digit series for serials. Keep a spreadsheet that mirrors that code, so you can sort and filter instantly. Stick a tiny label on every part, maybe a plastic tag with a quick‑write barcode. Store similar codes together in drawers or small boxes, marked with the same code range. Keep a master index sheet that you update every time you add or move a part. And remember to date each entry; it’s the only way to catch a slip. If you see a “misc” pile, that’s a sign your system’s failing—add a new category or sub‑code until nothing is left uncategorised.

Sure thing—testing the first batch is the only way to spot a rogue gear before the whole system collapses. If a part keeps escaping the code, tweak its category until it fits snug. Just remember, the catalog should feel as orderly as my tea mugs, not like a chaotic toy attic.