With all the virtual teaching I see a lot of teachers have switched to standing desks for the computer work station. They seem to think it is more comfortable.
It is pretty easy to replace a office chair gas strut but as I remember there are two possible tapers at the top of the strut. You have to use a pipe wrench to take the seat off and check before ordering. It is similar to a Morse #3 taper. Make sure to wear gloves when you unclip the strut from the base. It will be black oily grease that does not wash off.
Bil lD.