Stamped 3440 BSI MG

Question

Trying to find the correct window balancer for Florida window.  Its a single hung non-tilting window.  The window balance has a metal hook that attaches to a block and tackle pulley system on a spring.  I believe that the plastic ends are not winged.  Also, I am missing the top sash guides, which are black.  Please let me know if there is any more information that you need.

Tom · Accepted Answer

Thanks for your photos. Based on what I see here, you have either our S351-35 or S390-35, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

You also mentioned missing top sash guides, but it's not possible to recommend a replacement without the original as a reference. Do you have an identical window in the house that has all the same hardware?

Comparison of the S351 and S390 balance shoes.