Drag link end cap

[AustinWood]

My method of doing this is to fit the drag link in position with the end cap fitted. Then I hold the drag link with one hand and hold the bolt in position with my thumb, pressing it firmly in place. A sharp tap with a hammer on the end cap causes the spring to compress momentarily. This is usually enough to allow the bolt to enter the drag link itself. If it isn't, hit it harder.
Once the bolt has started it can be tapped home.