This is a brand new Masterlock. I just got it today.
With this lock I learned a lesson about the tension wrench. Everything I've read about tension wrenches said to apply extremely light pressure. An ounce of pressure maybe, at most. But you don't realize just how light that is until you experience it.
For a few hours I was trying to rake and pick this lock with no success because I had too much pressure on the wrench. Even though it seemed like I was pressing lightly to me, I still wasn't being light enough. Now that I've learned how gentle you have to be I can rake it open every time. I also single pin picked it a few times but I'm not good enough at that yet to do it at will.