Thank you for updating this thread. It's really interesting and useful to see pictorial evidence of what other people are doing.
I have never grafted a cactus nor own a grafted cactus. Something in me just stands against it, and I'm not sure why because I have grafted and owned grafted plants.
In cacti, is the only goal to make the plant grow faster? That's what I've deduced but I have never seen that stated explicitly. In other plants, there are additional goals such as pH toleration, cold hardiness, resistance to disease, etc. But in cacti, it appears the only goal is to make them grow faster?
If that's the case I think that's where my reluctance probably comes from. In my view cacti are supposed to be slow.
