Paul from SWISCO responded:
February 2, 2016
If your sash weighs 22 pounds, you should go with the 3130 option. It's likely your sash droops down now because your spring is worn down. It is, after all, possible to have a balance that is too heavy, so going any higher could cause complications.
I agree that the Series 350 is similar but you will need to compare your measurements to ours to be sure. |
Tom from SWISCO responded:
February 3, 2016
I think that you have the 15-004. When measuring the depth of the shoe, you measure the entire depth, flange and all. You must also account for wear; that is, you have to keep in mind that your depth is likely a little less than it was originally. Considering these factors together, the 15-004 seems like the optimal choice.
Plus, in the off chance I'm wrong, you can always just sand the 15-004 down a little until it fits. |