These models are intended to be slipped over some 1" EMT conduit.
I found a number of models for recreating Rey's Staff from The Force Awakens, but I wasn't happy with the fidelity or accuracy of the ones I found. I made up names for the components as I went along, but you can use the 'Assembly' model to figure out where everything goes or the included screen capture of the assembly.
The sling on screen appears to be a pair of Lee-Enfield slings stitched and buckled together. Lobster clasps were attached to either end and a custom H-shaped leather piece was used to attach to the staff.