OK, I finally solved the beast!!
This puzzle is a take-apart puzzle and has several steps.
First you need to crack the code of the lock using the brass knob which produces clicking sounds and the symbols on the back of the puzzle.
This step was hard and I even had ideas that were trickier than the solution, but when you don't make progress you try to imagine what you can :)
You need to play with the puzzle in a quiet room, analyzing the clicks, their number and other things. Trust me, this will keep you busy for some time!
And as the lock doesn't pop when it's opened, then you need to pull up the shackle each time you think that you've found the right code.
You think you've solved the hardest step of the puzzle? Hummm, I thought so, but hell is coming!!!
Now you've unlocked the lock and taken out the rod, the cage of the thief can be rotated, from time to time it blocks, from other time it seems it can be pushed a bit.....But I am sure you won't understand the feature until you've solved that part. Not only because it's tricky, but also because many things are involved in this step locking the puzzle in many ways.
Right, part solved? Thief release? Now find her jewel. I looked everywhere and I could not find it....Damn!! I even thought I lost it on the floor when solving the puzzle ;-(
Remember: solve this puzzle on a flat surface. Things can fall...roll...
But actually there is no way the jewel can be lost, it's hidden somewhere and you will need to perform some more steps to find it.
After finding it, Jon made you a surprise! I cannot tell, but there is more to discover and you will really like it I am sure ;-)
Strongly advised for metal puzzle collectors and for people who like to be puzzled for long time!
Resseting the puzzle for the next victim is very easy, good news, no? :)
Not sure if they are sold out now (as it's in limited edition), but if not, you'd better be quick if you want one.
You can find Jon's contact on my previous post of the tumbler puzzles.