If your yoyo is not binding as well as it used to, it may be because your response pads are worn out. If you unscrew the yoyo, the silicone pads should be level with the recess in which they sit. If they are worn out they will be well below the level. Use a needle or pin to remove the pads and any excess glue. These pads are made from silicone and are a standard size fitting Yoyofactory (except Loop 360), C3yoyodesign, Yoyo Empire and Yoyofficer yoyos. The white ones are hard and make for a really tight bind. The purple is slightly softer and doesn’t last as long as the white. Some players prefer the purple because the yoyo returns to the hand more gently when binding.