Here is one of the Brother cast on combs, I am using it on my SK155 to do a live cast on, this would be for waste yarn as it will unravel if the comb was taken off after starting.
by Artes em Lãs e Linhas
by Sockmatician
by Craft Ideas
by Bloomingknitter
by New Stitch a Day: Knitting and
by Garnstudio DROPS Design
by KnitcroAddict