Thanks for reaching out to us. I am confident that we can help with this balance, but before we move forward I would like to know the exact weight of the sash that these balances support. I would also like a clear photo of the top and bottom nylon fittings, just to confirm that Series 390 is accurate.
Custom balances like this cannot be returned for a refund so we like to be 100% sure we get the right hardware for you before we ask you to commit to a purchase.
Thank you! Were you also able to get the exact sash weight? I will also need that before we can proceed.
Thanks! So in that case, we would be using our 4140 strength option. This can carry 24 through 30 pounds so it should be perfect for your sash.
I'll email you a purchase link and price quote now that will allow you to add 2 to your cart. Please let me know if you needed anything else.