Agaffer, your responsibility stop when he stopped you from removing the tubes because the unit was working properly and he seen that it was. Removing the tubes was the proper procedure but when he stepped in and stopped you then all responsibility was shifted from you to him. You should had made that clear to him that not removing the tubes could create problems due to the vibration during transport and that you would not be responsible if anything goes wrong once the unit left your house. Sometime you have to be strick about this that's the only way you can protect yourself, I had a customer do the same thing to me but when I told him I would not be responsible for any problem due to not removing the tubes he then said "go ahead and remove the tubes". Sorry you have to go through this. Let us know how it turns out!
Steve.
Steve.