Channel Guide Part Number Determination

Hello,

Take a look at the image below to determine if you need the S351-29 or S390-29. You'll also need a 2820 spring strength option for your replacement balances. 

You'll need to remove a balance from one of your windows with an undamaged bottom fitting to get an accurate measurement. Thank you!

Comparison of the S351 and S390 balance shoes.

Unfortunately, top sash guides are not determined by the type of balance the window uses. If you could show us photos of an undamaged guide removed from the window, along with written-out dimensions, we'd be happy to confirm if we carry a suitable replacement. 

I'm sorry to hear that your balances were incorrect. We hear of this happening from time to time where someone replaces the original balances with balances they happen to have on hand and cut them down to size, which means that the strength option was most likely wrong from the get-go. You can find our return policy for the balances you already purchased here. 

We can supply the 27-1/2" S390 balances that you need to support a 12-pound sash, but it will need to be a custom order. Just let us know if you would like to order the same quantity of 16 balances or if you would like to start with a smaller quantity. 

As for your top sash guide, take a look and compare the dimensions of the 18-031 to your part. Thank you! 

I'm not sure why one of your windows has a 27" balance but if the rest use 27-1/2" balances, then you would need the same length to replace them. We will work on getting you a price quote for 20 custom balances. 

In the meantime, you should confirm if all of the windows with this channel length have the same 12-pound sash. If they are heavier or lighter, our custom balances would not work. Since these are non-refundable, it's good to confirm that all of the details are correct before placing an order. 

If you would like to try purchasing the S390-27 to replace the 27" balances that you found, pricing can be found directly on our product page and you can also use the chart under the product description to confirm the correct strength option based on your sash weight.