Just use a gas lift arm. Should be able to find one that supports even a large tv.
I don’t know how I’d get that to work for vertical travel tho. I’ve only ever seen them used on hinged applications.
Chair gas lift would be similar to what you're after
I mean one of these. They have a fairly decent vertical travel.
@Nef started
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Just use a gas lift arm. Should be able to find one that supports even a large tv.