Use a locking cover available from Paul Jansen & Sons 800-236-2437. Use a resettable combination lock, brand name "Sesamee". They are about 10 a piece. For cleaning pianos use an industrial product called "SPRA-ZIT" from Mellowcraft Inc. I swear by this stuff. Call Tricia 419-243-6100. You can replace bridge pins with new bridge pins of the same size. Remove old pins apply "Woodtite". You will have to drive the new pins in with a nail set and a small hammer after you apply this stuff. This stuff has the consistency of water and you can get it to travel down the hole quite easily. It contains no hazardous solvents.
This PTG archive page provided courtesy of Moy Piano Service, LLC