I always seem to have trouble with this one lock. It has a very small keyhole. Therefore, the pins are also very small. The springs are pretty loose too. Getting them set without breaching them is a huge pain and takes a long time.
As for the smaller tools, you could check out SouthOrd's Slim-line series for limited access keyways. I haven't heard anything about them in particular, so I can't recommend them, but you could at least take a look. Good luck. If you do end up getting them, let me know how they are. http://www.southord.com