Short cable
I learned that Van's intends to post a service bulletin that requires the F-1227 Seat Ramp Cover to be in place when the stabilator tension is adjusted. If the cover is not in place, a bulkhead will be bent. Then if one manages to somehow get the cover back on, the cable tension will increase by a factor of 2 or more, thus over stressing the control system.
In my case, even with the Seat Ramp Cover in place and tension set at maximum, there are 6 threads showing on each end of one of the turnbuckles (3 on the other turnbuckle). After setting the tension, I removed the Seat Ramp Cover and noticed that the under-knee bulkhead was pulled back 1/32". If yours is pulled back much more than that, perhaps your cable tensiometer needs to be calibrated.
I called Van's Aircraft about the issue of more than 3 threads showing on each end of the turnbuckle. The first guy that I talked with would not stick his neck out and say that 6 threads showing was good enough, although he did say that if the length of engaged threads was greater than the diameter of the rod, then it should be OK. He also said that the cable supplier is allowed a tolerance of plus or minus 1/8". The F-1247B long cable should be 124" and the F-1247A short cable should be 33.75", as measured from rod end to center of eye. I recommend that the cables be measured before installation. An easy way to do that is to lay the cable on top of a tape measure, align the center of the eye up with the 10 inch mark, and then subtract 10" from the mark under the end of the rod. The cables can then be paired up so that the total length of the two upper cables equals that of the two lower cables. Or if a cable length is out of spec, then it can be replaced before installation. One of my F-1247A cables is 1/8" shorter than 33.75". Although that is within (barely) the manufacture's spec, it is part of the reason that there are 6 threads showing instead of 3. I called Van's a second time and was told that 6 threads showing was good enough. He is probably right, but I told him that I would feel more comfortable with a longer cable. He agreed to send me one. Unfortunately, Van's does not sort the cables by length. I may or may not get a longer one.
If Van's is listening, I suggest that the cables be sorted so that each customer can receive a matched set of the correct length. The time spent sorting cables will be more than made up for by not having to answer phone calls concerning cable problems. Fewer problems mean happier customers and more business.
Joe