Piccy would be good to see what it looks like, but any hitches I've done, Knotts, Alko etc all work roughly the same, the ball or eye head usually has two bolts securing it to the draw tube, the 2nd of which usually goes through the eyelet of the damper as Pete said
The other end of the damper secures to the hitch body some 12 - 18 inches further back on the hitch by another bolt (or two) Normally the damper is under slight compression, with your trailer unhooked, but if yours has failed, it might be slack.
When you put the new damper in, fit the draw tube end first, then you have to lever the back end into place to line up your bolt hole, this is sometimes a bit tricky as you will normally have to compress it as you do so. I usually drop a screw driver or some sort of locator into the hole when its roughly aligned, then reposition my leverage to adjust it up more carefully so I can get my bolt to run in easily, without the risk of cross threading it
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