I know the feeling. I once spent nearly a whole day travelling back and forth on the train to Slough when, having dropped the car off with the refurb guys and taken two trains home, I got a call to tell me that they couldn't get the locking nut off (Dealer had lost the one that came with car so gave us their crappy master copy, which turned out to be so damaged it didn't work!). Had to beg one from a local Nissan garage and train it all the way back to the wheel refurbs and then back home again