I loved the course, even though I have only gone through the first three or four lessons. I tried to take the cap jewel out of my movement and the retainer came out of its slot and I was never able to get it back. I the process of trying to reinstall it I lost it and could never find it. I also lose the cap jewel in the same process. I don’t think I have enough magification to do this procedure. I am 73 years old and my eyes are not that good. I am thinking of purchasing a stero microscope to help me see better. It is hard to do these maneuvers if you cannot see them. I will keep trying, but it might be that this is not something I will be able to accomplish. I sure did not start out doing very well.