Hi Tom,
Thank you for your response. Can you please tell me what I have to do to "tilt" out the lower sash so I can remove the sash to get to the balance tubes so I can identify if your 751 ribbed channel balance will work. The old timers at Marvin don't even think that this is a Marvin window after all. Thank you very much. -John
There's not really any trick to it, these are just pressure fit. You just have to pull the sash in. These windows aren't made much anymore for this reason: they can be a pain to deal with. Just make sure the sash is raised a few inches before you tilt it in.
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