Balance Tubes Needed for 19820-1985 Marvin Model ARB Double Hung Window

A quick learner from USA says:
March 20, 2017
Your rep thought these windows look like tilt window balances, but I don't think so. I think the windows are too old to tilt. What do you think?
User submitted photos of window hardware.
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Tom from SWISCO responded:
March 27, 2017
Yep, that's a tilt window alright. Just an older style. Specifically, the balance appears to be a match for our Series 751 ribbed channel balance. Take a look and see what you think!
A contractor from Smithtown NY says:
March 27, 2017
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
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Tom from SWISCO responded:
March 30, 2017
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.
28" Series 751 Channel Balance
28" Series 751 Channel Balance
S751-28
$11.73
Black Locking Terminal, Great Lakes
Black Locking Terminal, Great Lakes
15-197
$2.04
Balance knife lock Shoe
Balance knife lock Shoe
15-014
$1.09
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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