Iclane, answer to your question

There should be a plug in the end of the twine tube that is spring loaded.  Be sure the plug is there and under spring tension so it fits snug in the end of the twine tube.  You do not want the plug loose.

 

Check for a groove at the end of the twine tube where the plug is.  Switch the two twne arms, right to left and left to right.  This will give you a new wear area.

 

I remove all tension from the twine this help prevent the twine from popping back up the tube.

 

Have to go now but there are other things you can do, but I would check the twine tubes first.  I will post the next step when I am available again.

Iclane, answer to your question