wojtek18p wrote: He'll be able to adjust it himself.
Everything can be done by yourself, the question is whether it is worth spending so much time to find out the reasons. Even though I used to work as a mechanic of precision machines, even with a watch bracelet I go to a watchmaker now. They are mostly pensioners, their services are cheap and there is no point in me making any effort.
And you as you wish, although I once spent a lot of time to fix a similar clock with a similar fault. And I fixed it, but now it stands and collects dust, because it would have to be - as someone noticed - regularly wound up. And no one wants to remember that these days