A good way to distinguish which shafts to thread, Louet have released a new range of coloured heddles - available in 6 colours, Black, Blue, Orange, Green, Red and Yellow.
 
Please check size heddle you need based on your loom as follows:
 
Erica - 150mm (supplied as bundles of 100 heddles)
Klik/Kombo/Jane/Kombo/Magic Dobby -  205mm (supplied as bundles of 100 heddles).
All David Looms - 280mm (supplied as bundles of 100 heddles).
Megado/Spring/Hollandia - 392mm - (supplied as bundles of 50 heddles).