Andersen 531 Narroline Sash Balancer

They fit and work perfectly. Were a bit trickier to install, but that was due to the installation of the original balancer and not the new one.

Direct replacement window operates like new. Make sure you use measurement chart for correct part number

The perfect fit

Easy installation once you get the sashes out of the window casing. Good directions on YouTube and on the direction sheet that came with the product.slightly different construction than the ones that were in the 40-year-old window. Slight modifications made them fit just right.

Fixed my problem with the window.

ordered two and only received one. contacted sender and they sent me the missing item. other then that, all is good

I had an old Anderson 523 Sash Balancer with a broken string. This said it was compatible for the model 523 so I gave it a try. The old one had screw holes through the center of the unit and these have holes at the end through a tab that my older ones did not have. These fit perfectly in the old space. The tabs do extend out slightly but they screwed in just fine and I did not need to notch any of the frame. There is an awesome how to video I found on U Tube that shows how to replace these. Just search how to replace an Anderson window balance. The window works smoothly now and this is much easier and cheaper than replacing a window.

Almost as easy to install as the videos show. Taller windows are easier to do as you have more room to bend the plastic jamb covers. best to do in warm weather when plastic is more pliable. take your time, dont drop the sash. An extra person to hold the sash during the procedure might help. works great.

Exact replacement. Works well. Lower left side (plastic) jamb liner has to be bent and removed in order to replace this balancer. Order one before you attempt to do this job. They will surely kink and be damaged especially with smaller windows.

Fit perfectly