From 
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Anatomy of a window balance
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Glass size code
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1. Carefully remove the window sash from the vinyl track. The sash has to be low and level before you lift the first side out of the jamb liner. This permits the little metal cam on the bottom corner of your sash to brake the locking terminal that’s under tension inside the track
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1 (cont)
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2. Start by employing a safety step: Release the tension on the undamaged sash balance. Insert a screwdriver on the locking terminal and twist clockwise to release the pawl. Brace yourself—there will be immediate upward tension.
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3. Slowly raise the locking terminal and let it rest at the bottom of the balance cartridge.
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4. Remove this type of vinyl jamb liner by working a stiff putty knife between the window stop and the track. Grab the vinyl edge with one hand, then pry the knife outward to release the jamb liner and avoid damaging the wood stop.
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5. Study the jamb liner components and how they’re put together. Determine which is the top end of the jamb liner and which is the sill end (the angled cut). Remove the foam cap at the top, release the S-clip and slide out the crippled balance cartridge. Remember which balance cartridge came from which channel of the vinyl jamb liner. The cartridge with the shorter S-clip is always installed on
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6. CAUTION: Parts under tension. Wear safety glasses for this step. To install a new locking terminal (the place where the nylon cord is properly strung in the pulley system), start by firmly clamping the balance cartridge to a workbench. Pull out 6 to 8 in. of cord, position a locking pliers at the bottom of the cartridge, clamp the cord end—to resist spring tension—then thread the cord through a new locking terminal. Tie a knot on the end of the cord, grab the terminal, release the pliers and slowly retract the locking terminal to the bottom of the cartridge.
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7. Position the locking terminal at the end of the cartridge so the pawl is facing up and toward what is the room side of the window opening. Slide the cartridge down the center of the channel in the vinyl jamb liner and hook the S-clip over the top of the track. Replace the foam cap and reinstall the vinyl unit into the window opening.
Copyright ©2005 Home Service Publications, Inc. All rights reserved. Unauthorized reproduction, in any manner, is prohibited.
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