Hi there - I believe we have Milguard single hung, non-tilt windows and it seems that one of the window balances is broken. I think one of the hooks must've snapped, so now the window closes and rests askew.
There aren't any markings on the channel balance besides "32 4 BSI ov". I can't seem to find any replacements online. There is a sticker on the window that has this information: "Series: 6210/6230/6230j/6270... AAMA / NWWDA 101/I.S. 2-97...H-LC30-48x78"