The double flyer wheel is now dusted, and the wheel that drives the flyers can be taken out. So far I haven't been able to get off the bent nail that holds the other wheel in place. Of course that nail sits on the treadle-side of the axle... It looks like I may have to saw it off.
The dead leather bearings for the left flyer are out (and some of the paint with them, but that couldn't be helped). I think I probably will have to change the other (painted) bearings, too.
The left flyer is now tied in place with cords, to make trying out different placements of the (probable) tensioner possible.
There are two possible ways that I can think of.
Either the tensioner was correctly mounted as it was (coming up through the frame). As it can't be raised enough to lift the drive band, the drive band has to be threaded through the "tensioner" before knotting, and as the tensioner has only one pulley, this is the one possible path:
Or it wasn't correctly mountetd. If the tensioner is mounted the other way. It can then depress the drive band to create tension - but both turns of the band have to go under the pulley, which doesn't look right, either:
I have also found that the right-hand distaff is not original. The right-hand finial (the non-threaded one) is "clumsier" than the other (see pics in the first post), the distaff arm is slightly thicker and the distaff istself has too many knife marks (it has been carved after the turning).
I have, of course, tried to find pictures of DFWs.
On those which have included distaffs, all of them have had only one. Why is that? To me, it made good sense to have two: even on the most perfectly dressed distaff it could happen that the spinner got hold of "both ends" of a fibre?