Can you tell me if you you sting double line going in the same direction or does one line go to the left and the other line goes to the right. I bought a split line cartridge where two strands are stuck together but the line goes all the same way. However the trimmer I have was from a neighbor who had a little line left on it and it seemed like one line went left and the other fed the opposite way. I just need to know which way the lines should feed. Thank you