Dear MMDers,  If anyone is interested I have put two links
to YouTube to show how tight bellows should be:

  http://www.youtube.com/watch?v=zO8RJIrZg9s 
  http://www.youtube.com/watch?v=WGoh7kujuNQ 

I myself have all my cloth made for me specially.

Steve Marx
Australian Piano and Pianola Factory
http://www.pianosandpianolas.com/