Then I must have the early stages of Parkinsons disease...
In the tubular receiver, the little dangling item must fit into the spring mechanism in the thing that pulls out of the grip. The only way to get them to match is to hold it all upside down as you press the grip/spring mechanism. Then the little flippy do-hickey will find the spring hole. It’s the only way. Once you know the trick and do it a few times it’s easy.