Lawson series 7500 - single hung window from the mid 1990's
Help - 36 inch window, your site was highly recommended, and I need help replacing 2 of my window balances. They have the marking h 3530 on the side. The attached pictures are of the good side, top and bottom plastic parts. With any luck, I would like to completely replace each side.
Lawson window help with window balance - h 3530

Handy Person from Florida
Nov 30, 2024 3:11 pm
5 user uploaded images
2 Replies

Bob from SWISCO
Dec 1, 2024 12:21 am


Thanks for posting. See our S380-36 or S385-36 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both balances with your old hardware to see what matches best. In either case, for a stamp option choose 3530.

Comparison of the S378, S380 and S385 balance shoes.
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