I have one or two locks that have a low cut pin in the front and other ones further inside that are higher. I have managed to pick once as a fluke and never reproduced it. Even knowing the bitting from looking at the key is of limited help. How can I detect such a "difficult" bitting and deal with it? Or is it not about detecting "Ah this is crazy bitting... let me just instead do..." or is it just a protocol of lock picking that results in high chance of success regardless of even bitting or steep variation?
Also, I have a Master Lock 140 which bosnianbill said has 1 or 2 security pins in it, only has 4 pins but I have not been able to SPP it yet. I have tried hard torque, gentle torque but I just cannot seem to get it open which is strange considering I have picked several Abus 30mm and 40mm padlocks which also have security pins and more pins per lock than this master 140. What could be my problem? Can you offer any info on how to approach the above crazy bitting and then how to approach security pins?
I think if I can learn to deal with crazy bitting successfully first, then going specifically to practice security pins should likely help me to improve my picking success.