I've read about using backer rod for dreadlocks. The process sounds easy enough. But I don't know what this product is, or wher it is commonly found. Lowes, Home Depot perhaps? Can someone post a picture of what this backer rod looks like before it is transformed into a dreadlock so's I can identify it? I've been bangin' me head against the wall brainstorming this whole dreadlock thing. Any help would be great!