You mention both foam and felt. You also mention a wing dolly which
was Udo's trade name for his rigging tool that had felt glued to the
inside of his fiberglass saddle much as my Wing Rigger does. Assuming
that's what you are talking about, I can answer your question on how
to glue the felt in place. Could you first confirm that I would be
answering the right question though as I am confused about the mention
of foam -- I don't think there is foam on a Udo wing dolly.