When I owned a school bus company one of my drivers (from out of town) mentioned that she was helping her husband with their truck. They had been using WD40. She had arthritis quite bad in her hands and noticed (once back in the house) that the pain had completely disappeared. At that time I used to weight train on a regular basis. My wrist was bothering me so much that training or even lifting my young daughter brought on severe pain. I decided to give WD40 a try. I would spray my wrist, wipe the excess off, wait 10 minutes, and the pain was gone. I would be able to train pain free and the pain would not return for at least 2 hours.
One morning I happened to mention my finding to my local drivers. Of course this met with laughter. One of my drivers that was in her mid 60`s said that she would like to try it. We went into the garage section and I sprayed one of her figures. A short time later she commented that before the spraying, her finger had been throbbing with pain. She did not know if it was in her head, but she was completely pain free. She continued to use it for years.
Sorry to get long winded.
Mike