These CAL400 movements can make Andy's 404 club. So you can replace both the main plate and the train wheel plate from a donor movement or you just put the movement into your junk pile, and reuse its parts if there is a need. I like the idea to rebush or jewel these pivot holes, i have many of these movements and I bought them because I like them and because its a cheap way to practice without worrying too much that you destroy a movement. Even though they are cheap I have a bad dream when i do something irreversible and irreversibly bad to any movement. Once OldHippy told us that they used to bring Timexes out and destroyed them with a hammer. I must try that out at some point as a brain therapy.
So what is easier, re-bushing or jeweling? And what tools are required?
You really want more than that. Amplitude and patter regularity are the first and foremost data needed. If you want to start learning now I'd say than a model 1000 today is better than a 1900 tomorrow.
I use an app on my android phone using the built in mic. Weishi 1900 is on my Christmas wish list. Single line trace shows that the beat error is minimal. Steve Sent from my Moto G (5) Plus using Tapatalk
Yes. My best teacher says one has to begin from bell tower clocks, I know he's not joking since he has repaired a good few ones.
But, every other day we have absolute beginners declaring their firm intention to attack their rare, valuable, and difficult time pieces. Sometime they can be convinced to know better, sometime they are not. But rarely they are then heard again.
Either things can be done. Questions for a beginner are, do you have all the tools needed? And (maybe more than one) cheap / disposable movements to practice? Then, consider if the money and time related to solving the above can be better spent for something else still in the field of learning repairing / servicing?