I can't say what's right or wrong regarding these Nicopress sleeves; All I can do is relate what I chose to do. I used the zinc-plated 428-3-VG oval sleeves, and I decided to use two of them on each cable as pull-through insurance. Also, I had planned to reverse the cable so the factory end was at the pedals, but I changed my mind. The main reason was that the loop of cable wrapped around the AN111 thimble was captive up front, but not captive at the rudder; I would have had to use an area washer on top of the AN111 thimble and I thought that would look like hell. I am convinced that I can adequately inspect these Nicopress crimps in the footwell with a mirror and a flashlight.

A couple of recommendations: When using two sleeves, be careful to get them aligned before crimping the second one. It's kind of hard with that big crimping tool, but it's something to watch for. My second crimp was ever-so-slightly off so there's a small bend in the cable (visible in the photo below).

The other tip is that the sharp end of the cut off cable (I used a Dremel with a cutoff wheel) will cut right through the heat shrink tubing. On the second one, I wrapped about 1" of electrical tape over the two cables to secure the loose strands and sharp edges. Then the heat shrink tubing slid nicely over the two cables.

Obviously, you'll want to gauge each crimp with the GO gauge.