the rope broke on my mower, so I bought a new rope, and followed instructions on how to tension the spring, and rewind the new rope, I turned it 5 times, put the new rope on, and let it recoil. It seemed fine, but then I did not trim the rope, and after recoil, it did not recoil all the way, the rope, but when I pulled on the rope, it did recoil as it suppose to, so I put it back on the mower, but once I pulled it, the rope would not rewind, and I guess, I have to take it apart again. What causes this. Its quite upsetting, since I really need to mow. Could this mean the spring has come loose, or something.