I found that the spinner's top (button housing/connector) is almost identical, if not exactly the same, as the ones used on the standard SMOK egos. And seems to very similar to the Twists in how they're also a press fit.
I have no clue how the dial mounts - I didn't mess with that at all.
However, I was able to pop mine apart by holding the body in my hands and pushing the button housing back and forth with my thumbs; turning 180 degrees between pushes. This eventually rocks the connector up out of the the tube. Be careful when it's coming out - you don't want to pull the wires out of the solder joints if they're not already apart.
I was able to get mine apart w/o using any tools, but requires strong hands and/or maybe some gloves to lessen the chance of hurting yourself

Or you could use soft-jaw pliers or gently clamp the button housing in a soft-jaw vice if you're worried about marring the surface.
I didn't want have to mess with soldering, so didn't pull it completely apart for fear of popping a wire or two. I only repositioned the button a little and put it back together. It's still wonky, but hey at least its working again.