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Need replacement part for Milgard window balance.

A home owner from CA says:
Hi,

I am looking for window balances replacenent part for Milgard window Balance with following marking.
There are two balances on each side of railing for the windows.

29 6 GV CMC 2
The metal part of the
length 30 inches
width is 1/2 inch.

Thanks,
Chal
User submitted photos of a window balance.
Profile picture of Dave
Dave from SWISCO responded:
Hey, Chal. This looks like our S385-30 channel balance. Just make sure the sizes of the nylon attachments are the same as yours!
A home owner from CA says:
I see 30" Series 385 Channel Balance has a number of choices for options. How do I determine the correct option. I did get a 2960 and thread broke within 4 window up and down movements. So, is it ok to go with 2970 and still window be safe to operate?

Thanks,
Chal
Profile picture of Paul
Paul from SWISCO responded:
I wouldn't recommend doing that just yet. I think at this point it would be best to determine how heavy your sash is. Once you know the weight of the sash, you are better able to determine what option you need. These are precise systems so it's best to avoid guessing.

For comparison, two balances with a 2960 option can carry a sash weight of 32 through 35 pounds, a 2965 option can carry 35 through 39 pounds, and a 2970 option can carry 39 through 42 pounds. How heavy is your sash?
A home owner from CA says:
Thanks Paul,

I will measure weight order the parts as suggested.
A home owner from CA says:
The weight of sash is 31.6lbs.

So, based on the weight chart, should I get 2950?

Thanks,
Chal
Profile picture of Paul
Paul from SWISCO responded:
Yes! Based on a sash weight of 31.6 pounds, a stamp option of 2950 would be perfect.
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