... /11/29 and Report Revised: 2011/01/19 Bimetallic Thermostat DESCRIPTIONPRODUCT COVERED:USR, CNR, Component -Temperature ... long, held in place between Shaft and Short Spring.6. Insulator Rings - Ceramic, three provided, ... long, held in place between Shaft and Short Spring.8. Insulator Rings - Ceramic, three provided, ... shaped as a hook. Secured to the Lower Spring by rivet. 19. Hammer – Plated steel, ...