A quick learner from Crofton, MD says:
July 25, 2013
686I have an Andersen Balance stamped E39 9#31 586. Can you tell me what the replacement part would be?
Tom from SWISCO responded:
July 26, 2013
Sure thing. Check out our 24-939 Andersen sash balance. This can replace balance boxes with the stamp 9#31.