First things first, it's a no. 3 - so the plug rotates both directions. They almost always pick easier counter clockwise, so try that for starters. There is no false set, as they only contain regular pins, so what you're more likely to be feeling is a sudden change in slew caused by the looseness of the plug. Someone here did take one apart and found a couple of spool drivers in it, although he was very surprised by the discovery as he couldn't feel them when picking... so in all honesty, you shouldn't need to be treating the pins like spools even if there are some in there. The tolerances are extremely low in the no. 3, and because the drivers are so tiny it won't make any noticeable difference.
The fact that you're hearing 3 clicks and not 4, even though it feels like all the pins are set, is quite strange. Even if one of the pins was underset, you'd still hear 4 clicks... I'm a bit stumped on that one myself, maybe someone else can offer an explanation for it. Don't get frustrated though, that's one of the things stopping you from opening it!
Try it counter clockwise, and take care not to overset any pins as it's very easy to do with these little locks. Ease up on the tension... I know the tolerances aren't great, but you can still overset them prety easily if you're using too much. If all the pins feel set and it's not opening (and you're
certain that you're not using too much tension), test for securities just to be sure. Occasionally reducing tension to let a pin or two fall back down again helps aswell, like I said it's very easy to overset pins because the plug is so loose and constant tension doesn't really work too well because of that. You'll definately get it, just don't get annoyed with it! The feedback is a bit weird because of the plug, just be careful with it and remember minimal movement with your pick as the pins are really tiny.
You'll have it in no time as long as you vary the tension a little. Sometimes it even helps to use heavy picking pressure, all depends on the lock really. And when I say heavy, I mean heavier than necessary... don't go bending your picks or anything like that.
