I need to repair a bunch of double hung windows,here's my problem. Sometime back, I think the 70's, I helped my father repair a number of DH windows with weights. What he used (after removing the weights and parting bead) was a pair of plastic "tracks". These fit in the window cavity after removal of the weights and pulley. They were formed with a parting bead that had "spring loaded"sides and held the sash in position.
I can't find these. I probably never knew the name, and no one knows what I am talking about. In 1990, I bought about a dozen replacement sashes (wood sash) that came with plastic tracks and some kind of very compact spring balance built into them.
Does any one know the name of what I am looking for? Seems to me I saw this on TV a million years ago, I recall that they had to rout the old wooden sashes to accept the plastic parting bead.
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