Grafting new varieties of apple onto a single tree

I have an apple tree in my backyard that produces green crabapples that are not very good for eating raw. Because of this, I wanted to experiment with grafting some other varieties of apple onto the same tree. Over the last two years I have grafted Gala, Red Delicious, and Fuji apples onto the tree with with differing levels of success. I wanted to record a video to document the process and hopefully share some knowledge and experience to others trying to graft their own trees.