You have a chance to set a fruit or two next Spring.

Thank you. Any idea on what is taking place in that tree that allows grafts to work?

The cambium layers healed together allowing the graft to get nutrients.

You should try again but down low on the trunk. If your host plant turns out to make not good fruit you could chop it down and have just the lamb hass. A little work now for options later.

I was wondering how this scion changes the host tree, to make it fertile.

It's unknown because the characteristics of the rootstock are unknown. As far as a/b flowering.

The lower branches are sunburned. Is it ok to graft on them?

That was the reason I didn't go lower.

The graft is dead.

I waited eight weeks to pull the tape.

It was too soon.

I will continue trying

I regrafted it. Here is a photo. I believe I am at the edge of the desired time for grafting. I will leave the green ties on until I see they are dead or who knows how long.

It would be nice if there was something to help with the capillary action.

Bottle graft

Just cut that branch off and make a V-cleft graft in it. The best would be with a scion wrapped in parafilm or buddingtape so the scion can sprout through the tape.

You can also cut the stem of the tree off and graft onto the sprouts. Leave the tape on untill the scion has a few set of leaves and then slowly cut it off. Avocado is not that hard to graft.