The Novoflex MiniConnect is a well made quick-release system that uses a tiny camera-mounted nub to connect it securely (VERY SECURELY) to a spring-loaded locking base. You can use it on a tripod, or as a base for a removable strap (there are a pair of loops built in.) In excellent condition, with a single camera nub.

Image is for illustrative purposes only. Actual item may differ slightly.