Clock Pendulums and Pendulum Accessories › Seth Thomas No. 2 Suspension Spring. Used on other regulators as well. Image 1 of 1 Seth Thomas No. 2 Suspension Spring. Used on other regulators as well. $11.95 Seth Thomas No. 2 Suspension Spring. Used on other regulators as well. 1-3/16 long. Only a couple left!!! Add To Cart Added! Seth Thomas No. 2 Suspension Spring. Used on other regulators as well. 1-3/16 long. Only a couple left!!!