I made my first repair video back in 1990 making it available to the members of the National Association of Watch and Clock Collectors, i.e. collectors, watch dealers, jewelers and novice watch repairers who were battling with either theory or technique. They sold like wildfire with many thank you notes and requests for any lessons which might follow. That first video has since evolved into a complete course consisting of 6 videos and the course manual "Watches and Why They Work".