Hello All,  Adding to Craig Smith's entry regarding felt, another
source one could try is:

  Aetna Felt Corporation
  2401 W. Emaus Avenue
  Allentown, PA 18103
  tel.: 1-800-526-4451 or 1-610-791-0900, fax: 1-610-791-5791
  info@aetnafelt.com
  http://www.aetnafelt.com/

I have no vested interest in this company other than that they have
been most helpful in the past in their customer service and materials.

Regards,
Rick Hageman