I'm working on a system that requires a small cord (~3ft long) to retract up into a reel and lock in place so it cannot be pulled away from the reel. Sort of like a seatbelt mechanism after it's been pulled too far or too hard.
I'm hoping to find something off the shelf that is small and lightweight (~100g) before building my own solution. I've found industrial spring reels like these, that are of the correct size and construction, but none have the locking functionality I'm looking for.
Does this mechanism sound familiar to anyone?