John_B, if there are no leaf nodes that did not already have a growth already then it might be tough for anything to grow on your scions. Your first photo showed some cuttings that you could take with leaf nodes intact. Good Luck with your graft.
850FL, sounds like a crazy task to dig up a tree that big. I'm planning to dig up a 10ft multi-grafted citrus tree (7 varieties) and put it in a temporary pot (55 gal trash bin). But to pull out the tree & rootball with soil from the hole after I finish digging, I plan to use my engine puller to get it out enough to slide/roll it into the pot. Then its pretty easy to stand up the pot and since it has wheels will make it easy to move around. As for the 92 SC400, it was an auto, but the engine & trans was such as good deal I bought it for my spare backup since I had 2 of the same car, one Black and other Gold. Now that I junked both cars since they both hit over 300K, I have to disassemble the engine & trans to get rid of it. Next project is to spend some time trying to rebuild my 69 vette (100% restoration needed), still sitting in my garage not running. I'm rebuilding the carb now.
Yeah, I agree those avocado cuttings are tough to root. I grafted 70 seedling avocados this Jan and as I cut each seedling, I plugged them in the pot to see if any of them might root, but so far 0 % success rate.
I should have mentioned earlier that John_B could have tried to save the tree by re-attaching the broken halves of the tree. I have done this with my Valentine tree (1" branch with too many fruits) and my Sumo tree (same thing, 3/4" branch) and both are now happy and continue to grow and fruit just fine. The trick is to quickly re-attach the two parts as soon as possible before the cracked ends dries out. I'm not sure if the Avocado tree would work the same way, just need to experiment and try it next time.