My preferred method:
I wait until I get about 1-1/2 of new growth then I latch the two locs together at the root. Then I cut the very tip off one of the heads & unravel it. Then I braid the unraveled part around the remaining loc head.

My #2 method:
I wait until I get about 1-1/2 of new growth then I latch the two locs together at the root. Then I leave either leave the two loc heads as they are or just twist them together.