Try to match the tension of the rope when stitching the crossover from Mark A to the width of your thumb.

When splicing some new braided rope the core and "cross over" will bury by milking the jacket as shown.

The crossover is where
the two ropes join. Locking the crossover at this time is a good way to prevent it from accidentally slipping during the "milking procedure." Let the core bunch up to detach the Super Snake. Taper the jacket before milking both ways to restore the proper tension between ropes that the strength of the splice depends on.

If you don't understand the principal of the "Chinese handcuff" cut a short length of the braid as shown,
and play with it until you do. It is the key to splicing braid. Think of the fingers as the core and crossover. Here's a little trick that often works when the crossover won't completely bury. Forget how hard you just worked because it's just like being "stuck in the mud," backing up and taking another run at it often works.

    Here is a little story that might explain where a lot of these ideas came from. At an "All Sailboat Show" in Long Beach on a slow Monday, a sailboat owner watching a splicing demonstration remarked, "If my boat had just been 10' longer, I would have been able to milk down enough slack in the jacket to bury the crossover.
     When he left he knew how to sit in one place, extract the core through the side of the jacket about the splice area, put an awl through the mark A yarns at the crossover to stand on (it also keeps the crossover from pulling in too far) holding on to the temporarily extruded core to stretch it tight while shoving a short length of bunched jacket down to the crossover.
    Making the eye is the hard part. Old sailors have been making two ropes the same length for years. The fact that one rope is inside the other shouldn't be a problem.
    You are encouraged to conduct a comparison "stress break test," and to find out what happens inside the splice out of sight.
    Run a length of sail twine through the rope above the splice at right angles, any movement of the core can be seen before a splice fails.