Thanks for the reply and for taking time to search the info for me !! Those types of grafts seem to be done in summer, at first I looked at the incisions and thought ,wow this cust will cost me a finger or two ..haha ,then I read they are made on new tender growth and it cleared to me ...
I will try them in summer on the rootstocks that do not sprout from the spring grafting ...
I found a pretty informative video , nicely explained about grafting walnut with dormant scion and active rootstock...
https://youtu.be/KQv65gYTtNU