Fleetwood model 4068... Advice?

[VintagePC]

I've sent them an email and am waiting for a reply.

While googling, I came across this:

http://www.angelfire.com/electronic2...ge-rebuild.htm

Anyone tried it before? Or will that hack only work well in a mono cartridge?
I have several piezo buzzers I've salvaged... and it's not as though they are expensive. Perhaps I'll give it a shot.