Helwig Carbon Products, Inc. manufactures constant force spring assemblies for all types of motors including foreign made motors. We carry the most popular types of springs in stock ready for immediate shipment. Improve brush life and reduce maintenance costs with constant force springs. Handy guide shows a picture of the spring listed by motor manufacturer along with spring specifications. Also available on our website at: www.helwigcarbon.com under products & services, spring assemblies. For additional information on constant force springs contact Helwig Carbon Products, Inc. at 800-962-4851. Or e-mail us at: firstname.lastname@example.org to get information today.