Jamb Spreader?

Does anyone use a jamb spreader on tilt ins? I have run into some tilt ins that require quite some force to open and wonder if anyone uses these?

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I don’t but a homeowner actually showed me once that his windowed came equipped with sliding wedges at the top.

A spreader is a good idea so as to avoid twisting the glass. Speaking from experience…:persevere:

Where do you find such a device? I’ve come across some very stubborn older marvins

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I was looking online and found one here http://www.windowtools.com/techspecs.html

Just curious if anyone ever used one or something similar.