EvoRed wrote:If it stops after 180 degrees you just need to push down the driver pins at the bottom as they will be trapped in the top opening of the keyway. Just use the back of a pick or the long side of a tension wrench.
Just to clarify things a little bit. This is a normal occurance when picking locks and something you have to look out for.
If you think about it, normally a key is in the keyway and when you turn to the 180 degree position, the top pins ride on the bottom of the key. Without a key, the pins can fall into the keyway.