The 66 is much easier to take apart and re-assemble. Do you see that dirty old tension in my avatar? My grand daughter took it apart, cleaned it and reassembled it. she was 7 years old at the time. I doubt if you should have any problems. The first one I did was 45 years ago. No Utube. I had to try to figure it out from the owners manual. I got it to work though. There are a lot of parts. Keep track of them and don't forget to clean the pin that goes in the post and don't lose it. Some owners manuals have a blown up picture of how it goes. That is very helpful.