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How to use and remove a thule lock
Follow the instructions provided with your thule product.
Like their swedish compatriots ikea, thule tends to use lots of pictures and very few words in their product instructions. However, once you get the hang of it, the instructions are relatively easy to follow.
If you don't have the instructions, however, don't despair. The lock cylinder systems for thule products are standardized across practically the entire product line.