Spring mechanism for a tilt window

A landlord from Tinton Falls, New Jersey says:
Hello,

I have two bedroom windows that won't remain open. I believe the spring mechanism is broken on both. There are no names, numbers, or markings on the piece. It was enclosed in a plastic sleeve. The attached photo shows the spring outside the sleeve. It's just over 29" in length.

The windows are more than 20 years old. I don't know the manufacturer.

Can you advise?
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Bob from SWISCO responded:

Hi, and thanks for posting. Could you confirm that the tube is 29"? We only count the tube for length, not the spring. Just want to be sure!

A landlord from Tinton Falls, New Jersey says:
Hey. Thanks for the reply.

Just measured it -- the tube alone is 28".
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Paul from SWISCO responded:

Okay the tube is 28". Now if the tube is 3/8" diameter, go with Series 900-28". If it is 5/8", go with Series 600-28". Please note our tubes are metal not plastic. You will also need the color of the nylon bearing when ordering. Review the media guides alongside this post for more information. 

A landlord from Tinton Falls, New Jersey says:
Bob and Paul, this was helpful.

Thank you!
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Bob from SWISCO responded:

Glad we could help! If you have any other questions just let us know. 

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