Plating on the SK Single Bed Machine

We were chatting about plating on the SK the other day on Ravelry, then again to a friend. It seems I'm not the only one who had trouble following the manual. Here is the bottom of the page out of my manual, It doesn't look right.  And the important piece of taking the main yarn out and replacing it after, is essential. The trailing yarn MUST be able to slide behind the main yarn in the crescent shaped curve, or IT DOESN'T work. Most annoying. but there it is, twisted yarn before the sinker plate, is no plating.

Here is the slot where you put the latch/tapet tool

Which doesn't help. I turned the sinker plate upside down to try to see what to do.

And you can see the slot behind where the yarn usually sits.

It doesn't look right. The yarn behind is the one that trails behind the main yarn and is placed IN FRONT of it before the stitch is completed. The purl side yarn slides in the slot.

And here's the whole page of confusion.

There is a plating accessory for the ribber that fits all standard and fine gauge ribbers.