S385-20

Question

Not sure about stamp option... old part has "2040" stamped on it... should I use "1940"?

Bob · Accepted Answer

Are you certain you're working with an S385-20? Is the metal channel, not including the nylon fittings, 20" in length? If so, then the best thing to do would be to obtain the exact weight of the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description of the balance's shop page.