I concurr with dave, the decoder dosen't seem to work, I have suspected that corbin or whoever sesamee is now has put a wider null area alongside the wheels, just to elmiinate this. I opened one of these the hard way last year, I started at 1950 and tried combinations till it opened at 2002. (the birthdays method) I found that as I approached the combination, I could feel a little jolt feedback as I neared the combo. this may only have been in the last ten combos. if you can use a tinsnips, fine file and sandpaper, you can make a decoder out of .003 feeler gauge, but still its pretty useless, there is a difference between the master lock knock off of the sesamee, in that sessame has a comb of 4 fences that drop on the four flat sides, while master has only two fences and each drops on two flat sides facing each other.