Hi. I have a Swift Sterling Eccles Topaz 2008. Hartal lock has failed twice, once when away in Northumberland. Holiday cut short. Lock freed off after oiling and 24 hours later. Dealer checked no fault found. A week later failed again, could not get into van. Eventually managed to open but then it would not lock. Lock replaced with one from a new van by Torksey caravans.Hi Dave
It be worth a quick e-mail or letter direct to Hartall. Tell what you did and why.
You never know , they may feel partially responsible and send you a new lock foc.
Cheers
Alan