spiral balance 34" length x 15/16" diameter

Thanks for posting, Bob! Before I can recommend an applicable replacement for your balance, I just need to know a bit more information. First, can you tell me if your window is tilt, or non-tilt?

Then, can you confirm the diameter of your balance tube? 15/16" is very large. Our spiral balance tubes usually come in diameters of 3/8" or 5/8" (or 9/16", which are considered 5/8" in the industry).

Thanks for posting, Bob! You may have one of our Series 600 spiral balances. Take a look at that and see if you agree. At 34", I recommend that you look at our S600-34.

For your tip, I recommend the color black, since your sash is 35 pounds. An S600-34 with a black tip can carry a sash weight range of 31 through 40 pounds.

Keep in mind that this information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.

Finally, I believe you mentioned something about a bottom bracket. I'm not quite sure as to which part you refer; if at all possible, could you upload a picture of the part in question? If I can see a picture of it, I may be able to suggest something for you.