Single hung aluminum windows (circa 1977)

A handy person from Georgia says:
Old house needs fix-up and I'd rather not do a total replacement. Are these fixable and if so, how?
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A handy person from Georgia says:
This appears to be either a Series 200 or Series 303 . Judging by the color I'd guess the Series 200 but I don't know the window manufacturer and don't know if the "shoe" at the end is the same for both. I'm tempted to order a sample set just to see if these are the answer. What do you experts think?
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Lauren from SWISCO responded:

Hello, thank you for posting! 

I am not positive which series is needed based on your picture so I am going to have one of our senior experts take a look and see if they could recommend a replacement for you. We'll reach out as soon as more information is available. Thank you for your patience. 

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Paul from SWISCO responded:

Hello,

I believe you have a discontinued Keller window that was made in Milford, Virginia. You didn't show the window lock, so compare 90-028 and 90-031 that were used by the manufacturer. If it is, you would need S303-23 where the spiral is approximately 3-5/8" longer than the balance tube. Please confirm that the length of the tube is 23". Other parts are, 18-002 top sash guide and bottom sash clips, 17-018 / 17-019 .


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