I use the 2 piece 50/50 also. The boomerang is just used as a spaces to you the strings apart so they can be clamped in the right place. Many time the boomerang tools just don't fit, aren't available, or they pop out. You could also use anything to hold the strings apart. A string, sharpie cap your finger, S hook, socket extensions, dowels, or anything else as thick as the strings are spaced apart.