Vibrating ring Stack

I made this vibrating ring stack by push the motorized pen into a swimming noodle (throwing away the pen point). I knit a holder that the noodle is inside of out of trash bags but one can come up with an easier way to rig this up so that its attached to the tack. Maybe just tie something around it and attach a clip.

The kids all loved this, it really holds their attention and quite a few said "more". It tends to require using both hands, one stabilizing while the other places the ring. One girl stood on top of the horse reaching high to grasp the ring and then squatting to place it over the noodle.