If my memory serves me right when a spring driven clock was wound up fully and didn't work everyone said 'You've over wound it' You can't overwind a spring driven clock what stops them working is wear, Sticky old oil or dirt.
Take it to a clock repairer who will inspect it for wear on all moving parts especially drive cogs teeth.
then will give a rough estimate including cleaning.
Don't be shocked at the price its not an easy job I've done it, not repairing but assembling small to large clocks and most work is done through a magnifier which can play havoc on the mince pies (eyes) with some especially me wearing specs n'all, so had to give it up.
Moved on to gold leaf work beating to 1/64 thousands of an inch (Green when looked through) and applying to book pages, covers and spines as well as plaster of Paris objects, thought I'd get that in. Another looks easy but not job.
Bob, August 2014
