Secure Grip - Replacement for Fischer Walkingstick

This quite simple model is my first own model. It solves a problem of a family member, he lost a little part of his walking stick by fischer. The stick is already old so no replacement can be ordered. This is the part where I come in, I simply look at the other stick to redesign this part. 

It might be a simple part but it's very important. This little thing secures the grip of the walking stick, without this thing the grip would be loose and properly lost.  

!!Well tested with Bambulap Basic Filament!!