A security seal for a collar used for tensioning springs in garage door assemblies. A collar typically includes at least one set screw projecting outwardly and at least two winding holes. The security seal of the invention includes a generally longitudinal piece of flexible material having two opposite...http://www.google.es/patents/US6378170?utm_source=gb-gplus-sharePatente US6378170 - Security seal for collars used to tension spring in garage door assemblies
Security seal for collars used to tension spring in garage door assemblies
