Andersen 531 Narroline Sash Balancer

This fit as predicted by Anderson references (always check!). My window was NOT the tempered glass. Some installation tips say that the top panel that covers these should be replaced, but it can go right back in. If you have never done these before, just watch videos, read instructions, and work carefully. You may have to remove trim on left side to get the track out. If you break a piece you probably can replace it, but not cheap! If you can afford it, do both since you already have the window apart.

extended the life of my windows

it fixed the window

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

Appears to be a genuine Andersen product. It was kind of a pain to replace due to the size of my window and the fact that the window had extension jambs, which means you cannot full remove the header piece, but the window works like new now that it is done.

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.

perfect fit shipped fast

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

Be aware that to install this in pre-1980 Andersen windows you will need to chisel or rout a 3/16 recess in the window frame to install to accomodate the lip with the screw holes on one end of the balancer as stated in the instructions that come with the replacement. I used a sharp 1/2 wood chisel. I strongly recommend watching the video for this project on Andersens, Swiscos or Youtubes websites. Its not as easy as the video makes it look. Particularly with smaller windows. Always replace both balancers. Once installed, the balancers worked fine.

Perfect fit!