If an extra plate is riding along with your dumbbell it's a sign that either your cradle ends are adjusted too tight (every cradle is set and checked at the factory, but can come out of alignment during transit and shipping if the boxes are mishandled) or Your dumbbell plates need to be cleaned. Please refer to your owners manual for simple instructions on how to adjust your cradle ends with the 4mm tool included with every MX Select Dumbbell set. MX Select Plates can be easily cleaned with Armor-all automotive wipes or spray to remove any spilled liquid, dirty or buildup while also adding a smooth low friction finish to the MX Select plates.