Large opening in the throat of the sabre.

[Jacenty]

In the case of a sabre guard attached to the handle shaft, a large hole is encountered on the side of the blade.


Please explain what was the purpose of making the guard in this way?
It seems that a guard that does not fit tightly to the blade during use will loosen quite quickly and will protect the hand poorly.
Some of the pictures show filling this hole with some kind of glue or something similar. This is unlikely to be a permanent connection.