So I've been trying to pick my recently acquired Master Lock 220. In another thread on the site it says the 220 has 5 pins and has security pins. I've tried using a c-rake, half diamond, and a short hook and nothing has worked. I also tried to shim it today but that didn't work either. Basically I'm wondering if anyone has any advice to give me on this lock. I've picked locks with mushroom pins before and they haven't been a problem.
Also my tension wrench sits in the keyway at 45 degrees off of vertical so I don't think I'm applying all of the torque from the wrench into the plug.