Half the keys squeaked on a Kurzweil Mark 10 when the keys were played. I noticed in looking at the mechanism at the end of the keyboard where I could see that the keys were squeaking because the vertical tab that is part of the key was rubbing on the felt on the rotating weight that gives the keyboard the weighted feel. It is supposed to rub there as it pushes on the weight but apparently the felt had dried out or something and was making the squeak. The solution was an ordinary shishkabob bamboo skewer, a very small piece of duct tape and some graphite. First I removed the front metal cover just under the keys. This is a couple of inches wide and just longer than the keyboard. I put a very small piece of duct tape maybe 1/4 inch long over the very end of the skewer and made it stick out from the skewer less than 1/4 inch. Some dry graphite can be put on the tape from a squeeze bottle and then the skewer can pass through the slot under each key and pushed in until it comes into contact with the tab on the key that is squeaking. This lets you know you are just over the squeaking felt. Then turn the skewer over to turn the tape upside down to dump the graphite on the felt pad that is now underneath the tape on the skewer. Press the key to work in the graphite. Sometimes it helps to push the key very fast repeatedly to distribute the graphite over the felt.
