Channel Balance Hook

This balance came out of a older metal frame window. Kinda held in by two screws but kinda just sat there. The metal clip will clip into the shoe then a retainer clip locks it in

This is from my tilt sash window. I cannot find any markings on the window to designate its make. 2130 is the only marking that is on the balance itself. The spring is what is broken (see IMG_3028) so if a suitable replacement for the whole balance unit is not available would the spring be available ... (cont.)

Meigs County School system has older windows. The Channel Balance is 30" with B2950 markings on back with the bottom that is in pictures. Can this be identified?

I have a building that has some bad sash balances. They are a 27C block and tackle tilt sash balance that are 9/16" wide. I do not know the manufacture of the windows, it is an older building.

I have 20 dbl hung aluminum windows that are no longer operable and requiring the old balancers to be replaced Units are about 30 + years old and all tilt in, was able to remove the balancers but couldn't extract the pivot shoes Is there a specific formula on removing and installing these? ... (cont.)