Help ID my Spiral Balance?

A quick learner from New Mexico says:
I want to replace my window balance. I have attached several pictures of my old balances. Some with measurements. I was unable to get a color but the closeup I took of the end might be black. I could not get the sash out of the frame so I put a scale on a piece of plywood and set the whole thing on the sill. I lowered the sash down (both balances were already removed) and weighed the sash. It weighed about 28 pounds. I believe that the part I need is the series 306 withe green tip based on your weight chart. Am I correct?
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Bob from SWISCO responded:

Thanks for writing in. This was a good deduction on your part, as the Series 306 has a similar bracket shoe; however, I believe your balance's shoe more closely resembles our 15-073. Look it over to confirm. If that's the case, these balances actually have to be custom made. We'd be happy to do this for you, but we need just a little more information to get started: 

  • Can you confirm the length of the 3/8" outer tube? It appears to be 29" in your photos but I want to be certain.
  • Can you confirm the length of the internal spiral rod itself? It should be either 1" or 2" longer than the outer tube. This determines what spiral balances we use as a base (either the Series 300 or Series 900). 
  • Since you've helpfully provided the sash weight, all else I need to know is how many balances do you need? From there, we'll get this started for you. Many thanks. 
A quick learner from New Mexico says:
Bob,
The spiral rod measures at 31" and the outer tube is 29". I attached some more pictures including 2 showing a close up of the 5/16" foot. Can you take a second look at the foot I think it resembles the 15066 foot. Can you confirm? On the bottom of my sash the foot clips into a hole in the frame.
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Bob from SWISCO responded:

Thanks for getting back to me, and thanks for the extra photos of your old bracket shoe, because they did give me some pause. I double-checked with one of my senior experts who knows this hardware inside and out to be sure of what to do here. We actually no longer carry this exact bracket shoe, but either the 15-073 or 15-066 could work as a substitute. Therefore, you are correct, you should be fine with our standard Series 306 balances. Apologies for the confusion on my part.

There is one question that remains. You say your window sash weighs exactly 28 lbs, but if you have the S306-29, neither the red or green tip cover that weight. Could you double-check the weight of your window sash to be safe? Many thanks.

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