This is a Marvin Tilt Pac balance tube/clutch I need to replace.

Home Owner from San Francisco, CA
It's a bottom sash tube.  The marking reads "40S, then "BSI" then "MD".
The clutch is aluminum finish, which doesn't correspond to the color code (regular, heavy duty super heavy duty, etc. for any replacement clutches I have seen. The sash weighs about 35 pounds and has these markings: "1GCC 'R' CBA, 1GMAC CIG-6, 4-01
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Emily
Emily from SWISCO
SWISCO
Expert

Hi there!

Thank you for contacting us. We're happy to look into this. I'm afraid the stamp on the balance doesn't help us ID what you may have so we'll need more information. Can you remove an undamaged balance and show us photos of the fittings on either end? Can you also confirm the length of the metal channel? Could you confirm whether the metal channel is plain or ribbed? This page here will depict each. 

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