Andersen 531 Narroline Sash Balancer

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

Fixed my problem with the window.

Did what I expected it to do

Mechanism failed at 18 year point. Needed to match exact window with balancer. Lots of good encouragement on the YouTube and from Andersons website for DIY. Hardest part was removing side vinyl/plastic panels without cracking or scraping casement. Patience and persistence paid off.

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.

Work great

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.

I liked that it went in without having to modify the 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.

Installation was a breeze. You take the two window sashes out and the top cover for the balancers. The current balancer was just stapled into place so I had to pry it out. The new one went in with the screws provided. Now I dont have to use an old plastic bottle to hold the window open anymore.