Received some Marumi kumquat scions and grafted them onto the Taitri tree inside my greenhouse. Marumi is a great kumquat variety that is cold-hardy (not for Zone 7 unfortunately), but it will do well inside this greenhouse with a small space heater. Hopefully, I will be able to use it for hybridizing in the future.
In this video, I used four different grafting techniques (or three if the veneer one isn't exactly right).