27L custom balance.

I agree with your assessment, that's exactly what it looks like. We can custom make a 27" long balance using our 62-105 hook. Does that look good to you? Also keep in mind that our Series 770 installs at the top using a screw. Is that how your current balance works?

Please also confirm the weight of the sash. 27L is not a stamp I'm familiar with and we will need sash weight to confirm how this spring ought to be calibrated.

Finally, the last bit of information we need is quantity. Once you've cleared up all this info, I'll email you an order link and price quote for that many.