PGT window spiral balance

A handy person from New Smyrna Beach, Florida says:
I have PGT windows that have spiral balances (24" x 5/8" w/blue tip. We are about 100 yards from the ocean and the ends of the spiral balances are rotted off. Some of the aluminum frame is also gone so there is no place for the balance crows foot to connect to. Is there a part that will screw to the bottom of the sash and provide a new seat for the balance? The rest of the window looks OK. I have just ordered three of your special balances with the hook type crows foot to use on half of the windows which aren't so badly corroded (3 single hung windows), The remainder of the windows are too far gone. Please help. See the attached picture
User submitted a photo of window hardware.
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Paul from SWISCO responded:
In your situation, I would recommend our S500-24 non tilt window spiral balance with a blue tip. I would also recommend a 17-012 bracket, which screws underneath the sash.

Being a builder's grade window, the sash won't be removable. However, we do have a possible solution for replacement.

With someone helping you, you will need to drop the new balance in from the top of the sash, screw it in at the top, then let the spiral drop down. You will then raise the sash and, while someone holds the sash in the open position, spin the spiral up to the bottom of the sash. Finally, with our 75-004 tool, give the balance about three turns to charge it and lock it to the end into the sash clip.

Let me know if you have any more questions.
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