Guide
Everything about 340/12
Open the question you have. Full guides on texsolv.se.
What do the numbers 340/12 mean, and how do I measure?
The first number is the length, 340 mm (13.4"), the second the eye, 12 mm (½"). To check an old heddle, stretch it gently between two sticks against a tape measure and read the full length. Don't measure a cut piece.
VideoHow to Measure Texsolv Heddles for Your LoomMelissa at Yarn Barn of Kansas shows how to measure a heddle
Many thanks to Yarn Barn of Kansas for making it.
Which colours, and what are they for?

One colour per shaft makes the threading readable from across the room and shows at once where a heddle belongs when you add or move one. A colour can also mark a border or a stripe in the warp.
340/12 is made in white. Colours are made for 150/12, 160/12, 205/12, 220/12, 237/12, 268/12, 280/12, 318/12, 330/12, 392/12 and Mirrix.
Colours on texsolv.seHow do I mount and thread them?

Slip the tied bundle of 100 onto the heddle bars, untie and distribute. Cut ends never need fusing. To thread: fold the warp end, push it through the rectangular eye with a finger and pull through. Easy right- or left-handed.
Made a mistake in the sequence? A new heddle can be inserted at the correction point without re-threading the shaft.
Which looms use 340/12?
This is a less common intermediate size. It fits looms with a shaft opening of approximately 34 cm / 13-3/8" between the heddle bars. If you are unsure, measure the distance from the top of the upper heddle bar to the bottom of the lower bar before ordering.
Not sure? Measure an existing heddle (watch how), or look up your loom in the guide.
Can I wash them?
Yes, in lukewarm water with a mild detergent, preferably tied together in a laundry bag so they do not tangle. Let them dry at room temperature; do not iron or tumble-dry.
Sizes, colours, the loom guide and the full hints booklet.