In regard to mechanical bird repairs: The "drums", as you call them,
are actually rubber covers or in some respect, bellows.  They have been
available from a clock parts company, R.S. LaRose.  I don't have their
address or phone but you might find them on the Web or through a clock
repair person for sure.

Jim Jelinek

 [ The firm's Internet domain name is registered to this address:
 [
 [   S. Larose, Inc.
 [   3223 Yanceyville Street
 [   Greensboro, NC 27405  USA
 [   tel.: 203-798-0810
 [   http://www.slarose.com/
 [
 [ -- Robbie