Mini tripod with ball head, EVA Ball (mine is from a car antenna ball). Dismantle the ball head from the tripod.
Use a sharp pointed knife and make a hole in the EVA ball. Don't make it too big as the EVA stretches. You want that. The hole should be 1/2 the size of the ball head. (pictured is my prototype, bit rough on the edges)
After the hole is made.. Put some glue in the hole of the EVA. I didn't because Eva is kinda grippy. And if you made the hole just right it would just fit and grip the ball head just fine.