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Whether it's a storage hatch, a cabinet lid, or a compartment door that keeps falling shut on you, a gas spring sized to the opening does the holding for you. This one runs 7 inches compressed to 10 inches extended and pushes with 20 lb of force, enough for a lot of lightweight lids without being so strong it slams.
A straightforward way to get a hatch or lid to stay open by itself, without rigging up a separate prop rod.