This kit fixes the loud squeaking of early Quartets.

1. Detach lever cords from levers.
2. Remove the lever brace from the Quartet (attached with machine screws and barrel nuts).
3. Turn the lever brace upside down and remove the machine screws holding the lever block assemblies.
4. Use the same screws to attach the new lever blocks to the lever brace.
5. Reattach the lever brace to the Quartet. Reattach lever cords, following instructions in the assembly manual.