In January 2015 I discovered that a silly cacher changed the code of my combination lock. After asking Dr. Google I discovered this video and became a tank-booster (even if the title is in English they guy is talking German):
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Some months ago this happened again with the lock, I used to fix my „Simon says“ cache. This lock had 4 digits and it’s much more difficult. But today I sucessfully got it open by the same approach!