Grafting

Frank11 starts with ...
Hello

I have two fruit trees I wish to graft or bud onto:
A Santa Rosa plum;
An Emperor mandarin
The Santa Rosa is located at Walpole and is actually a limb on a seven-year-old 3-way multigraft stock. It blossoms, but produces nil or only one or two fruit, whereas the other 2 limbs fruit prolifically. I don't know whether I have a pollination problem, or whether the limb is defective, but I wish to graft from another Santa Rosa onto it and observe the results. If I can locate a healthy Santa Rosa and the owner is willing to part with some minor cuttings I plan on doing this in August (next month).
I have an Emperor mandarin growing in Morley that I wish to convert to Imperial. If I can find a willing Imperial owner I would take cuttings, store, and graft in spring.
As a follow up for both varieties - depending on the success or otherwise of the grafting - I might seek to take some new season growth in autumn 2016 from one or both donor trees for autumn budding.

If anyone has a tree of either or both variety, and is willing to part with some minor cuttings, I would be really glad to hear from you.

Cheers