SWISCO - The Replacement Hardware Authority

Marvin double hung balance replacement

A quick learner from Montana says:
Hello,
I have several windows that won't stay where I open them to. They can free fall. They are approximately 20 years old and have a blue plastic part (I think it is the clutch???) that is broken or the string going to them has broken.
I see that marvin uses a new system. Is it possible to upgrade?
Thank you
A quick learner from Montana says:
I forgot the picture.
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I believe that the clutch you're talking about is our 15-014 lock shoe. The balance this is most commonly used in is our Series 751 tilt ribbed balance. Is this correct? I can't confirm based on your picture. Carefully compare these to your own hardware to confirm. For instructions on how to replace these, see the video below.
Profile picture of Paul
Paul from SWISCO responded:
I believe that the clutch you're talking about is our 15-014 lock shoe. The balance this is most commonly used in is our Series 751 tilt ribbed balance. Is this correct? I can't confirm based on your picture. Carefully compare these to your own hardware to confirm. For instructions on how to replace these, see the video below.
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