Let me try and make myself understood, Jasper ...
You must have the grip tapering in a way that you push it firmly towards the swell, until you get it 'stuck', to prevent it from oscilating; no more 'hollow' space between this and the crossguard ferrule.
The British example you show is correct; but i am afraid your previous example doesn't fit into the plug bayonet category.
I am no expert though; but it helps to look at a couple hundred plug bayonets in rather comprehensive R.D.C. book; none has rivets in their handles, by the way.
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