I don't know why it will not run. 24 pendulum that is heavy.
Mounting bracket and suspension spring. Hands, 5.5 minute hand, hour and second hand. Brass weight, About 6.5 high, and 5.5 lbs (top and bottom caps are loose but are fine when hanging). The item "Seth Thomas Regulator Movement, Reproduction.Plus Weight, pend, bracket, hands" is in sale since Saturday, October 13, 2018. This item is in the category "Collectibles\Clocks\Parts & Tools\Parts".
The seller is "rob-o" and is located in Queensbury, New York. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.