Over here it's pronounced Royal Christie.
Why wedeln was done wrong by so many people is that they took the word translation lietrally, tail wagging. So they set out to wag the tails by pushing them around from side to side, mostly by putting weight on them.
Tail wagging is a RESULT, not an intent of the maneuver. Correct wedeln is done with forward pressure and rotary input which makes the shovels bite and ALLOWS the LIGHTENED tails of the skis to brush out. Why wedeln was so revolutionary was that it was the first time turns, even quick ones, could be performed from the hips down without involving the upper body. Previously upper body input in the form of rotation or counter rotation was involved as turning forces.
Wedeln can be done with skis together or apart or even on one ski since it doesn't depend on one ski to work against the other.
If done well, the mambo looks very slinky and is done by rotating the upper body as far as it will go, the movement then starts to to transfer to the skis which start to turn. At the moment the skis start to turn to the right, say, the upper body is rotated to the left as far as it is possible while the skis are still turning to the right and only will start to turn to the left when max rotation is achived. Repeat. It is a snake like movement. I used to be able to do it with both poles crossed behind my neck, under the chair, natch
In the serpent the skier looks like he is going to fall on his nose were it not for the skis to catch him just in time.
Except for wedeln, those maneuvers are useless show-off skiing.
Kneale had it right, are we showing our age