You can use the glue, but a lot of times the leather will slime causing the glue to be ineffective. Personally, I use a rubber band. I particularly like the thick, loose rubber bands that they use to bind up asparagus. I
Of the three unmounted leather frags I have purchased, one I was able to glue, one I was able to rubberband, and one I just shoved in a nice close joint between two rocks.
I used the rubberband and toothpick and for some reason it like eroded away from the toothpick and then i found it in the anenomes tenticals. It survived. I hate to use the word eroded but thats what it seemed me but it didnt really erode away.