Lower sash parts

A contractor from Denver, Colorado says:
I am attempting to repair a lower sash on a prism window. If you raise the sash there is nothing that prevents the bottom of the sash from coming out of the tracks and swinging freely. I don't know if it is a side balance or some sort of guide.
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Paul from SWISCO responded:
Most Prism windows use coil springs for their window balance systems. You might have a broken bottom pivot bar like the 26-336, which would explain why the sash swings out at the bottom. Can you confirm?
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