When placing the barrel lid back on the barrel, make sure that the clamp is tightened around the top where the lid fits into the barrel's neck. If the clamp is tightened lower than the lid it can lead to premature wearing of the neck and possible leaking from the lid area.
Please note, these barrels are a consumable item and wear out over time. They are not covered under warranty except if they are defective.
These barrels tend to blacken over time. There is no way to prevent this from happening.
Regularly maintain your tumbler by greasing nylon bearings on each side where the shaft rests in the aluminum casting. You can use marine grease or white lithium grease, both should be available at your local hardware supply store. Covington's tumblers are designed and built to last you a lifetime!