SInce I started picking two months ago, I'd only opened some no-name five- and six-pin cylinders, but I wanted a challenge so I bought a secondhand Assa 701. It came with a key but I purposely didn't look at it so that I would have no clues. I could, however, see the driver pin of pin 1, so I knew from its position that it gave a false set.
It took me about a week, working on it for an hour or so most nights while I watched TV before I finally got it. It was certainly tougher than my other locks – there was very little to no rotational movement when a pin set and I had to use very light tension throughout. I used my Majestic hook and z-shaped tension wrench.
I suspect it's going to take me a while to get it open again but it feels good to have done it once. I got two blank keys with the lock, so I might try impressioning some way down the track.
I'm going to buy a Medeco Biaxial for my next challenge after I become confident with the Assa.
Andy