Would start by reading this thread
And this one
Mulberry make a nice graft line. Most of these photos was the control mulberry in my experiement. This first picture im pointing out the side branches i removed streamed sap for weeks. I bring this up because flooding of the graft may have been the cause of failed grafts @steveb4. @TNHunter had perfect grafts in his case because of timing and method and skills. Pointing this out because he made it look easy but it is actually not. It easier for some people than others due to perfect weather but method and skills must still be very good. @steveb4 your grafts likely failed due to our weather rather than anything else it can make things tricky. Flooding the grafts with sap causes failure everytime.