@jhz563 Welcome to the start of a new addiction LOL!
With any clockwork, friction is your enemy ! Also running on carpet etc is ok , but has the detraction that of course any loose fibres floating about can get sucked in and entangled in the mech.
Turn it upside down and make sure the mech is clean and free from rubbish as best you can and cut off any trash that may be wrapped around any of the powertrain shafts , dont forget to check inside the little governer mechanism ( the bell type housing with a little flywheel/brake/limiter unit inside)
Then when you have got it as clean as you can apply some light oil to all moving surface points , if the spring looks tarnished or rusty run some oil in there as well to slow the oxidation and help lube as it unwinds ... That will be messy but repeated usage will grind off some of the rust and get it as free as it can get without actually removing/replacing the spring itself .
Dont forget other friction points too such as carriage wheels etc they all slow things down
I dont have any new collection pieces to add to the thread just now , but be warned I am stalking what I think is another rarity, just have to work out a price with the owner without getting too excited
Hint... its a variant(?) of ...