balance springs for my windows

A home owner from florida says:
my windows are a pain to open and close. Photos attached to help you identify them. white caps,3/8 diameter,29 inches long. the T on the bottom attach to parts of the window. I don't see how to remove the window to check the attaching points or how to charge the balance springs.
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Tom from SWISCO responded:

Thanks for contacting us. If your balance tube is 3/8" in diameter, then I recommend our S400-29 . Look this over and let me know what you think.

Your sash probably cannot be removed. Most non-tilt sashes that use this kind of balance aren't designed to be replaced. You'll need a charging tool like our 75-005 to charge the balance and hook it into a hook which is most likely in the bottom corners of the sash, tucked away and out of sight. Using the tool to hook the balance in will make life a lot easier than trying to do it by hand.

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