I'm not Shrub, but I'm far more attractive, and equaly able to answer your question.
A curtain pick is different, to a 2-in-1 pick.
A 2-in-1 pick is so named because it as two 'arms', one to move the bolt, and the other to lift the levers. Essentialy a wider tube slotted over a metal rod. I can't think of any sites that have a clear picture I'm afraid.
For non-BS locks that don't have a curtain (The Union 3 lever lock being an example) the 2-in-1 pick is the best to use since it is so comfortable and grips the bolt nicely.
In a curtained lock, when the curtain is turned, it moves the bolt. This means that you only have to turn the curtain to create tension. The curtain has a raised area that catches the curation and turns it.
Here's the curtain, interracting with the bolt of an Invincible:
Sorry for bad photo quality.
You turn the curtain as far as it will go, and this allows a wire pick to access the levers and lift them.
Does this clear things up?
Get yourself a cheap BS lock like an ERA Profit, or Invincible, and take it apart and see how the curtain grabs the bolt, how the levers are lifted, how you could get it picked... just ask yourself about how you could beat the lock. If you do all this, then not only will you know exactly how the lock works, but I;d be willing to bet you'll have figured out how to make a pick.
Ben
