Do you leave valuables in your locked panniers on long trips away.
Well think twice,
I recently had to change one of my locks to keep them keyed alike, here what I found out during the process.
Here's a photo of the tools and lock tumbler.

Click on the Picture to view the video:

Cheers
Paul
Wow, that is very disappointing. I had to try this myself, just to see if it was as easy as the video shows, and it is. Making a tool isn't even a challenge, since mine was the metal cross bar from a hanging file folder, trimmed down (quickly) with a pair of tin snips. Took all of 30 seconds to make the tool.
Looking at the innards of the lock (housing), it's not even a real lock. Just a plastic housing with a slot for the tumblers to rest in when locked. The cylinder itself does not use a lock retainer that pushes out the back side when compressed to remove the cylinder, as a real lock would have (requiring the lock be in the "unlocked" position to remove the cylinder).
Given the cheap plastic housing, and lack of a decent retaining pin, there's not much one can do to make it more secure from the lock mechanism side. Some form of externally added protection would be the only way to enhance the security.
They might as well have just used the old C10 "A" and "B" keys. I guess this way, at least they offer the illusion of security.
