Peter Collingwood described this kind of shaft switching device, where levers can be used to move the eye in a "transit heddle" between the eyes of two heddles mounted on regular shafts. Carol Irving guided me to the four-end unit threading described in the article Samba from Handwoven Magazine Nov/Dec 2020.
Some inferred measurements:
- Lever length 4.375, thickness .4 width 1/2”
- Pivot .475” from end
- Texsolv holes .67” from other end maps
- Side plank .9” x .377 / 3” inside to inside / 4.85” outside to outside / 3.9” on center
- 3/16 side rods
- 1/4 pivot rod
- L-channel
- .43 in vertical center to center of woods
- Shaft rod: 1.25 x 3/8
- Device width: 47”
