Had a bit of a hiccup with the Space King Titoni.
Was running OK but power reserve was way down and my watchmaker had informed me of it before I picked it up but he wasn't happy to do any more on it have stripped and rebuilt it a gazillion times trying to resolve it.
Luckily I had found an exact NOS replacement off of eBay but according to the seller it had issues of the minute and hour hands not working for an unknown reason. It was an old ( but new ) movement and I can understand their reluctance to refurbish only to sell.
I hadn't wanted to do an outright replacement as I normally prefer to preserve the vintage history but in this case other than a gold coloured balance wheel the replacement balance wheel was silver otherwise indistinguishable other than it had perfect screws and wheels unlike my original which you could see the slightly mangled screw heads etc of a well used ( abused) movement.
So I bit the bullet and said do the swap out.
He found the minute hour hand problem to be the cannon pinion needed tightening and a date problem plus whilst it ran perfectly the timing did the odd glitch so he changed out the balance wheel to the original gold one, problems all solved!
Now it runs perfectly.