try giving light tension on it. then, go through all of the pins, from the most binded to the least, pushing down slightly. do this a few times, pressing a little deaper each time. you'll probably set a few pins & false set a few security pins. You'll know you've done it right if the plug turns a few degrees. now you've just false set one or more pins.
What I do next is feel all of the pins to see which one(s) is/are false set. If it is, when i press down on it, the plug will turn back slightly. so just let up a small bit of tension & press that pin down until it sets. careful becuase other pins may pop up when that one goes down. that's where very careful tension comes into play. do this for as many security pins are false set.
Try to visualize all of this going on in your head & it'll make it easier.
If you haven't checked out the MIT guide yet, I recommend it. It's got a section on security pins, but the whole guide is fantastic. Here's another good site that has a lot of pictures (good for people like me
)
http://deviating.net/lockpicking/topics.html
-Rob
