Double Hung Windows

We have 9 double hung windows in our house. 5 out of the 9 will not remain open when you raise them. If you were to raise the bottom half of the window they would free fall shut if you let go of the window. There is a sticker on the window that tells the make date, sales order, and warranty code but do not know if that information would be helpful. The make date 08/16/1999. Sales order 60716631 and warranty 02414754. I do not know if it would be possible based on the attached pictures to identify the window manufacturer to see if these windows could be repaired under warranty. If not, I would like to know how easy it would be to replace any/all broken parts that will make these windows raise open safely and remain open without slamming down shut. Very dangerous in my opinion. You can see in the attached picture a spiral rod that is broken on the bottom left corner of this one window. There are some windows that the top half will slide down but not drop all the way so we would need a mix of parts on multiple windows to hopefully get these fixed.

Can you provide the part for replacement pivot shoes I will need? I would rather go ahead and replace them since I will be replacing the spiral balance rods anyway. I am sure the pivot shoes are shot too. Thanks for your helpful response.

Thanks. I will see if I can get a measurement on one of the pivot shoes so I can the correct size. One last question and first, thank you so much for your help so far.

I removed 2 of my lower sashes on 2 of my windows today. I measured the spiral balance rods on both windows. The diameter of the spiral balance rods are 3/8". Will the diameter of the spiral balance rods matter if I were to get new rods, 3/8" vs. 5/8"? Since the windows currently have 3/8" should I just go back with 3/8"? Or can I used the 5/8" and it be a better solution?

Also, on one of the two windows the pivot shoes free falls. I can take one finger and flip the pivot shoe up the track it slides super easy and freely in the track back down. The pivot shoe on the other side of the windows has resistance. It stays put where you stop it and there is no slack in it at all. So what can you tell me about the issue with the pivot shoe? Should they free slide easily with a small flick of the finger? Or should they have resistance and be hard to move?

If the pivot shoe slides easily and indicates a problem, will replacing the pivot shoe with a new one fix the problem or does that indicate that side of the window vinyl track has expanded and a new pivot shoe won't fix the problem? Or can the pivot shoes by tightened so they don't slide freely? When I remove the spiral balance rod from the pivot shoe it free falls to the bottom of the window track.

Thank you so much for your help and patience. I was able to adjust and tighten the spiral balance on the window where the top sash would creep down. So that one is now fixed.

I am definitely going to have to replace the spiral balance rods on the other windows. Before I place an order I have at least 3 more questions if you could help to answer.

1. I measured my balance rods but they measure 17 1/2", etc. This is measuring from end of rod to end of rod excluding the colored tip. So with this odd measurement would you round your measurement up or down to the nearest whole inch? Meaning if rod measured 17 1/2" would you go with a 17" or 18" rod?

2. If you have a window sash weight that falls within 2 weight ranges of both a blue and red tip, which would be correct to select and how do you determine when to go with what tip based on weight in this scenario?

3. I checked the pivot shoe and it will not lock into place. Is it critical these be replaced when they don't lock? I do not have a cutout to remove the shoes. So I will have to either cut out a notch or order the jamb spreaders to remove and replace these unless they are OK to remain as is.

Thanks.