I've attached two ponies to bases. One I attached permanently with screws and glue, the other I made removable from the base. The removable one has two screws in the top of the base at the positions where the pony's feet are, then I used an X-acto to cut Xs in the bottom of the feet and slipped the feet down over the heads of the screws. It's secure on the base and doesn't fall over, but with a bit of gently wiggling she can come off the base for easier transport. It was also a lot easier to do that way than the previous way.