If this is your first time using pull-pull, don't be surprised that the cables will loosen, due to stretching. Great way for controls. For the next one or if you ever replace these lines, just as a suggestion, hang some weight with the pull-pull wire for about a week to pre-stretch it. I used to use 5-10 pound lifting bar weights. I have actually used pull-pull on both elevators too on one plane. Worked very well.