That would be my guess Steve. That oil they use is pretty thick. I'm a firm believer in fix the simple thing first. Clean it and see if that helps. If not, you're not out of anything. Just take your time, and don't be afraid to wack it with a rubber/wooden/platic mallet as needed.
Watch a video, there are a lot of them, and follow the directions. You'll be fine.
For God so loved the world, that He gave His only begotten Son, that whoever believes in Him should not perish, but have everlasting life.
John 3:16 (NKJV)