Send us the Expandable drum.  We will inspect if there is any damage to the core.  The old rubber will be removed.  Drums are ground to the factory specified size, original slots machined in the rubber, high speed dressed, electronic two plane balanced for the speed of the sander, metal ends of the drum repainted, and returned to you.  You pay for Shipping to us.  It is your responsibility to insure the item, include your contact info with a telephone #, email address, etc.