I've noticed that some simple padlocks I have are decidedly more difficult for me to pick when they are in any position in which the pin stacks are not in the top half of movement.
That's probably a very poor way of explaining it, so here's something I hope will be more clear:
If the plug is imagined as a simple circle, the pins are usually located in the top half of that circle and the bottom of the plug would be in the lower half.
Now, if this positioning is inverted, I've found that the lock becomes considerably more difficult for me to pick. The most pronounced case of this (in my experience) has been with my Master Lock No. 532
I have gotten to the point at which I can consistently pick this lock when it is in a "normal" position (i.e; pins at the "top" of the plug) and, being a silly and non-thinking person, I mounted it upside-down on a thin rectangular piece of steel which is just wide enough to restrict the shackle's rotating on the strip. This prevents me from just turning the lock over and picking it right side up. Now I'm finding it incredibly difficult to pick this lock, even to the point of thinking it beyond my current capabilities.
Are there any special tips for picking locks which are oriented in this way?