non-tilt spiral window balance and attachment for old windows

Question

The old balance springs are 27" long and have yellow tips. I attached a picture - apparently they had plastic covers which are mostly gone. I found a replacement but I'm not sure I have the right one. Also I need the attachment for the bottom of the window.
It looks most similar to the red-tipped 27" Series 500 Spiral Balance and the bottom clips looks most similar to Window Balance Bracket Product Code: 17-083. What do you think?
Also - some instructions mention a tension adjuster - do I need this? And some sort of spring lubricant? Thanks

Casey · Accepted Answer

Hello,

Your original balances with the bracket fixed to the bottom of the spiral are no longer available. If the original housing tube measured 5/8" in diameter, you should be able to use the S500-27 spiral balances with the 17-012 mounting brackets. You'll need to weigh your sash to determine which color option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. We also suggest using a charging tool like the 75-005, which makes the install much easier. Thanks for posting!

Guide: How to adjust a spiral balance on a non-tilt window