To install the Libman 2017 mop refill: 1. **Release:** Push the wringer lever forward (away from the handle) to extend the sponge. 2. **Remove:** Slide the old sponge off the mop head frame. 3. **Install:** Slide the new refill sponge onto the metal hook/rod until secure. 4. **Lock:** Pull the wringer lever back toward the handle grip. This locks the new sponge into the rollers.