All manner of medieval devices will be called for. But I have to ask the question, why? They are not even shown as removable parts in the early microfishies.
If you must, the damper must be held from the inside of the tube, to keep the whole affair from spinning. Sometimes leaving them assembled with the spring pressure will hold the damper, If you've already pulled the spring etc, the trick is to use a broom handle, shortened usually. Insert it in the tube, set it on the floor and push down hard while hitting the allen with an air impact.
Others?