Today I re-tied and started weaving.
But for some reason treadle 4 felt very strange... as if it was somehow blocked. As if, in fact, I had a treadle tied up to both lift and sink one shaft.
But... but I had woven ok, and the only thing that happened after that was the cutting off.
Checked the ties. They were ok, as they should.
The treadle still did not work properly.
Re-checked the ties. They still were ok.
Scratched my head, had some coffee, read a bit, had some more coffee.
Decided it was a fixable problem, if only I figured it out. Took a deep breath and went under the loom again. And found that the tie from shaft 1 to the upper lamm had tangled with the tie from shaft 2.
Thus I had wasted the best part of an hour trying to fix something I should have spotted in five minutes, max.
The final weft choice: cotton 16/2 in a soft beige, kind of oatmeal - not quite as it looks in the picture below: