|I have used mylar flaps on the front row of pipes on my John Smith Universal.
They flap when the pipe speaks. I also added some LED lights in the
rear that operate off batteries and illuminate the internal working and the
valve action. These flaps and lights are a big attraction and point
of interest to the spectators.
The flaps are made out of very thin mylar, I believe the mylar I used came
as wrapping on plants to hide the pot. I think it can be had as gift wrapping
paper also, the secret is that it has to be thin and flexible.
I attached them with double stick tape, or they can be glued on with removable
glue. This is a big attraction for both kids and adults. We get a lot of
comments on them as they show each pipe as it speaks.