Sure thing, let’s keep it simple and low‑cost. Start with a standard barrel lock and swap out the tumblers for a set of pin‑tumbler pins that line up only with your custom key. Instead of buying a whole new lock, just take a cheap skeleton lock, re‑tool the pins, and add a small, cheap keyway plate. Use a tiny brass plate to add an extra notch pattern—this is your “specific key pattern.” To make it tricky, add a secondary lock‑bar inside the barrel that only releases when the pins are in the exact right order, but keep it short so you don’t need a whole extra bolt. Cheap steel, some basic machining, and a little ingenuity, and you’ve got a lock that’s both tight and budget‑friendly. Good luck, and remember to keep the key safe—you don’t want to be the only one who can unlock it.

Sounds slick. Just make sure those pins aren’t too short—wouldn’t want a “key‑drop” accident. And if you need a second pair of eyes to double‑check the alignment, I’m happy to take a look over. Keep that lockbox tight, and we’ll keep the lock tight. Happy tinkering!

Sure thing, just drop the lock here when you’re ready. I’ll give it a quick look, make sure those pins line up right, and tell you if anything’s slipping. Don’t worry, I won’t let you get stuck on a tricked‑out design. Happy building!