jw, "does not run because it was wound to tight" ....... is really a wrong diagnosis ...... even though most people think that is the problem.
Actually, when a clock stops working everyone assumes it needs "winding" ...... and gives or tries to give the "winder" another twist.
The most common problem with old clocks is that the oil/lubricant on the gear shaft(s) has dried up, ...... got gooey or sticky, ..... and is no longer oily or slippery.
Especially the "shaft in shaft" that turns the hour/minute hands.
Now I have fixed many such problems by "cleaning away the crud" with Lighter Fluid and then re-oiling with 3-in1 Oil, ...... or by using a Q-tip to apply WD-40 to the gears and shafts. The WD-40 "cleans & lubricates" in one operation.