S770 but for a Heavy sash

A landlord from Pearisburg, VA says:
April 21, 2020
I need to replace Channel Balances for tilt windows similar to your Series 770 (plain channel with spring on top, block & tackle pulley on bottom with 15-043 Terminal Clip which attaches to 15-129 Pivot Lock Shoe.)

Mine are 36F for heavy 39 lb. sash. Your 36 goes to D weight.

What are my options? Can I use your Series 880 Hybrid Balance? Can I reuse my spring in your S770 36D? My springs are 22.75? long unweighted.

Thank you,
Paul
Profile picture of Tom
Tom from SWISCO responded:
April 23, 2020

Hi there, Paul! We can supply this balance to you as a custom order, due to the extra strong spring it will need to carry your sash. Can you just tell me how many you need? 

Once I know that, I can email you an order link and price quote for that quantity. This will be like a private store page that only you can see. It will let you add the balances to your cart as if they were a standard product.
A landlord from Pearisburg, VA says:
April 23, 2020
I need 4 36F for 39 lb. sash. Thank you!
Profile picture of Tom
Tom from SWISCO responded:
April 23, 2020

Perfect, thanks. I'll shoot that over right now. 

Let me know if you had any other questions.
36" Series 770 Balance
36" Series 770 Balance
S770-36
$13.87
Terminal clip
Terminal clip
15-043
$0.74
Pivot Shoe, 9/16" Thick
Pivot Shoe, 9/16" Thick
15-129
$2.50
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
VIDEO
WATCH >
How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
VIDEO
WATCH >
How to remove window pivot shoes
How to remove window pivot shoes
VIDEO
WATCH >
Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.