UDG serves you well. After one wheel of my UDG Trolley Bag broke, I contacted UDG Customer Service. After sending the receipt, a couple of photos and an explanation, the Customer Service contacted me with a really nice email and promised to send a full repair kit.
This is what I got today. Spare parts more than I needed and indeed a FULL repair kit. The only thing which seems to be missing, is the manual for those (read: “me”) who don’t have a clue how to remove the broken parts and replace them with those above.