What is this tab? Edited to add: moving the tab to the side allows the spindle to drop back so that the flyer can be removed to change bobbins. Assuming I can find other bobbins, that is!
It's a double drive.
The treadle is held in place with leather.
There's a screw in the wheel. To balance it?
Tension adjusts from the bottom
It has one leg in back and two in front.
And a cute little treadle.
It's a totally adorable wheel, and L oiled it up and played with it, but she said she couldn't get it to draw properly. I think this may be because the wheel shimmies a bit. The spokes are a bit loose (easy to fix).
It would be cool if anyone knows what it is! TIA! :)