Some observations and a question…
Okay as to the possibility of manipulating these to recover the combination; I am certain that is is possible with enough practice. However, I don’t believe that it is something that could be written up and suddenly everyone is getting incredible successes either.
There is a definite feedback via both the shackle and the dial when the stylus moves in or out. There is also a very slight difference in the quality of the feedback as to which direction the stylus moved. Now given that one might think that the difference could be explained, but, the difference is extremely subtle. Given that, I believe that with enough practice and getting very used to the subtle difference in the feedback, one could get to a point where it is more like a muscle memory type thing in detecting which way it moved. So play around with them, I bet that given enough time you’ll get it down. I haven’t gotten it yet perfect, but I can determine the difference about65% of the time, so better than chance, but still not enough for reliability either. Good luck and have fun learning that! Also, I would recommend using a cutaway to verify the direction of movement. This is so far the only case in which I would actually recommend using a cutaway to learn to open a lock. They are very cool, and are great for teaching the concepts of operation, but are not a good learning tool for anything further due to the fact that it causes one to develop a crutch without which on will likly run into difficulty and have to relearn to operate only via feel.
Now, the question… Does the length of the blind code on the shackle correlate to the age of the lock? For instance, did they only use certain series of blind codes in various time frames?
Thanks,
Joe