I am having trouble with yarn cutting into my index finger while crocheting. As it is, I put a bandaid on my finger to help. I'm wondering if there is such a tool like this one, where the yarn slides through the grove, instead of rope(yarn) burning my finger.
I don't know off-hand of such a tool, but I do know people who have used a bandage or tape to keep from getting yarn burn. I will see what I can find for a tool for you as well.
Yes there is a tool to hold yarn on your finger...in fact, it can hold multiple strands. It's called a "yarn guide". Herrschners.com sells it. You can find it on this link:
http://www.herrschners.com/Product/Yarn+Guide.aspx Price is $3.49
this one is less than half the price of the one above:
http://www.knitpicks.com/accessories/Yarn_Stranding_Guide__D80621.html Price is $1.19
Joann.com also has it (so they might also have it in the local Joann store):
http://www.joann.com/clover-yarn-guide-/prd2727/ Regular price $4.49; Sale price $3.36