how to send a replacement piece which was part of an order to buyer using ebay

[granbys-ed]

A Pump was sent to a buyer ,he recieved it but the starter wasn't working and I wanted to send him a replacement starter at no charge using Ebay shipping

[comics-scifi-collectibles]

@granbys-ed.  You can buy a new label on Pirateship.com for the same commercial rate or less than eBay.    That's what I'd do.