How to identify a broken channel balance top.

A handy person from USA says:
Hi. Your website has been great to determine most of the parts I need to order, but I do have a problem that I need help with. Channel guide 2930, series 380 I believe. The problem: I can't tell what top sash part I need. The 3 or 4 that I have are all broken on the lower portion, hence no overall length can be taken. The width is 5/8", the height (prior to broken off part) is 5/8", and the top "cap" portion is 7/8" x 1/2". I have no idea what the lowest portion of these parts look like or their size. HELP! I might also ask what roll these play and when/how are they installed. Thanks so much. I do allot of handyman work, but this is my first interaction with windows.

A handy person from USA says:
Well, I'm awake now!!!!! Just kidding, but I did figure it out. After I looked closely at one of your diagram's, I saw that the top sash is actually mounted to the window frame. I removed the window, and the broken off part was still attached via the screw. Your part 18-161 is the ticket. I will be placing an order for those and channel balancers now!

Many thanks, Terry
A handy person from USA says:
Further update: I am online, trying to order parts, but am now unsure about the correct channel balancer. My old one is marked 2930. It does measure 30". Your part S380-30 looks perfect, except the online diagram shows 15-005 as being 1". My old one measures 7/8" or maybe 13/16".Is this still the right part? I looked at all of the other offerings, and they don't tell that dimension of the top and shoe.

I'm ready to order once we are clear. Thank you, Terry
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Tom from SWISCO responded:
Good morning, Terry! I'm glad you were able to find what you needed. As for the balance, our Series 380 has the smallest shoe we can offer, but I still think it's a good choice even if your shoe is a little more shallow. It's possible that it has simply worn down with age. Even if it hasn't, you could always grind it down to size if absolutely necessary.
A quick learner from Apollo Beach says:
Hello and thank you. I was thinking the same way, but was not sure given this is new territory for me. I will order and do as suggested if necessary. Thank you again,
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