Back in September last year at the start of this growing season my Swamp Cypress trees took off after their winter break. The one in the pictures below produced an adventitious shoot in a place where I didn't want a new branch and under normal circumstances would have just removed it as a matter of course. But there was a branch gap just above where a little more branch density would add to the composition so I allowed the shoot to develop and wired it into a loop early to place the new branch where I wanted it..
By late October it was ready to graft.
I wasn't able to execute a full hairpin so went for something that was closer to an approach graft. I made a groove in the trunk about the depth of the scion diameter and shaped to match the U shape of the bend in the scion at that point. A nice tight fit makes for a faster union.
By January the graft has taken well and the new branch tightly incorporated. As a half way house to full separation and removal of that loop I've cut a wedge out of it to diminish any contribution it is making.
So after about 2.5 months I have a new branch of the right proportions filling a gap that would otherwise take away from the composition. Fast, easy and a great result.
Inadequate branch density is a major failing of many bonsai, where they have been developed too quickly by simple styling of available material with limited cut and grow. See Bonsai Foundations on Facebook