Thanks for everyone's input. I called Yamaha ((714) 522-9000, Please call Monday – Friday, between between 7:30am – 5:00pm PST/PDT press 1 and press 1 for Electronic Parts) and ordered the part.

Given the cautions, I figured if I'm going to take it apart I had better do it right first time. The part (the whole 4 multipad grill) cost me $45.50 plus tax plus shipping, but the worst part is that it is on back order from Japan 4-6 weeks. Oh, well as you say an expensive lesson, hopefully well learned.

I'm still not feeling too bad about it, since the audience reaction to the song was wonderful. They (300 people) all stood up half way through the song, and joined in singing the last chorus. Quite a moment!

Graham