The color coded threading diagram was amazingly helpful, right up until I got to the "red" thread path. Blue: check. Green: check. Yellow: check. Red: arghhhhhh.
I turned to the included manual (the one for a Bernette 1200 rather than my machine, the 334 ds), where, lo and behold (what does "lo and behold" mean anyway? anyone know?) I found this little gem: press the easy threader lever, draw up thread, and release the lever. Easy threader lever?
A close look (is there still oil on my nose) revealed a minute little bit of metal than when pressed shot out a whole new gizmo in the machine! Mystery solved!
The easy threader is circled--tiny, huh.
And here's the gizmo that shoots out.
And true to its name, once found, the easy threader lever was indeed easy.
Next challenge: figure out the thread tension.