Replacing the belt is easy. Much easier than you would every dream. My son replaced it in less than 10 minutes. He just followed the directions found on a YouTube video. I purchased the belt online and it arrived in less than 2 days.
The treadle I have was from the family of a friend. I am the fourth owner and I have all the attachments the instruction manual and it is a beauty. I also kept the family history and dates of the owners. Someday, someone may care.