This can be done in Santishi at first, to get the hang of it. Later in any pose, even with fists or any hand shape.
1. Extend energy outward along ulna-to-little-finger line. Feel it.
2. Mentally 'cross' the energy stream sideways thru hand. Feel it.
3. Seat energy firmly into Tiger Mouth 'socket'. Feel it.
4. Energy automatically backwashes lighting up entire arm.
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The daling point described in Juice is crudically but indirectly involved. I will write more on this later, but the basic idea is that, just as the dantian is both the accumulator and emitter of power for the whole toros, in same way the daling is the activation center for the whole cestus region. In the practice below we are working with the entire energy field of the cestus region, but underlying that is the projection from the accumulated energy at the daling point. I've included another graphic below that was intended to illustrate a slightly different but related idea, anyway maybe it serves as a visual reminder that the cesuts unit energy does 'use' the daling as a staging area always.