Rapier/dagger filler piece

To be able to hold the blade to the guard/handle/pommel, a piece like this is needed. It has been tested and fits my dagger from dark wood armoury. Usually this piece is joined to guard, but this one has it without the guard so the guard can be added to designs.
However, it isn't one size fits all, so consider printing just this piece out or finding some way to test it with the desired blade before trying to design guard with it.