Channel Balance

A home owner from Virginia Beach says:
December 12, 2016

This is the only window in the house with this type of balance; all the others are similar to your Series 850 Crossbow Balances. This is an aluminum channel balance, with "2800 BS1 LK" stamped into it (see photo). It appears that the string comes down and connects to a strange plastic piece that doesn't move, either because it's wedged in or fastened. Also, it appears that the channel itself is wider than the track in which it resides, so I don't know how to get it out.

Any help would be appreciated, both in whether you have the right replacement, and how to remove it without causing damage! The channel itself is 28".

User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
December 14, 2016
Based on your pictures, I would recommend our S775-28 channel balance. Your stamp is a little different, so you would need to weigh your sash on a scale to confirm the best option.
28" Series 775 Balance
28" Series 775 Balance
S775-28
$21.91
How to install a S775 balance
How to install a S775 balance
GUIDE
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