Channel Balance Quote Request

That's a very weird stamp for a Series 770 balance to have. Can you confirm that this is the right Series? Would it be possible to see photos of your hardware? If so, please show me a picture of the top end, bottom end, stamp, and the metal clip at the end of the cord. Just to play it safe, I'd also like you to tell me the exact weight of the sash.

Thank you. I would like you to confirm the length of the metal channel. What you're showing me here tells me that the metal channel should be 34", not 46. I think 46 might be the weight of the sash. I'd also like you to double check that for me by weighing the sash on a scale. 

That's definitely 46" long. That's really weird. In that case, I have no idea what your stamp is designed to represent in terms of spring calibration. We won't be able to proceed without the exact weight of the sash, unfortunately. We will need it down to the ounce. The stamp usually just tells us what that is, but that is not the case this time. The number you have there is just too weird. I've never seen anything like it.

Stamps usually do give us tension, yes, but not in this case. Ordinarily a stamp of "3340 46" indicates a balance that's 34" long that can support a 46 pound sash, which is why I asked you to confirm the length, but it seems that the company that made your balance works totally backwards from that. I've never seen a balance that works this way before and I don't know what your stamp represents. It's so weird, in fact, that I kind of think that your balance was stamped incorrectly when it was manufactured.

Instead of guessing, which would probably just lead us to getting it wrong (as guessing always does), it's best that we confirm beyond any shadow of a doubt what kind of spring calibration you need. The only way to do that is to get the exact weight of the sash, down to the ounce. 

This is especially necessary since a 46" long balance will have to be custom made. Your Series appears to be a match for our Series 770, as I said before, but these cap out at 40". Anything longer needs to be made from scratch. 

To reiterate, guessing won't get us anywhere. Balances are too finnicky and too precise. We need to do this right, and that will require a sash weight.