Bob from SWISCO responded:
December 29, 2020
See our S380-31 or S385-31 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You'll then need to choose a stamp option. Your old stamp option of 3090 is from a rating system we no longer use. To know what stamp to select, obtain the exact weight of the window sash. Then see if that weight falls into one of the weight ranges we list alongside each stamp option under the balance product description. |