I have tried loyds cd from the cuckoo clock doctor. Before the DVD, I have purchased several books about repairing the cuckoo and they were all poor and not helpful to me. Loyds DVD is the best I have found but…. it is still complicated. In fact I had to email him with several questions. One great thing about him, once you purchase the DVD he will always help you if you have unique questions. He is another knowledgeable clock repairer who like Bob Tascione,is always trying to share their knowledge. His dvd is not nearly as good as Bob’s but Bob’s is the standard I apply all others to. I can sum it up as this, with Loyds DVD I was able to repair my cuckoo clock.