Appsy,
is that a bush in the end bracket or a ball bearing? It appears what we are looking at is the bracket withe either a bush or bearing mounted in it and then the end of the roller axle.
If that is the case the axle should press out rather easily, some more photos showing a top view of this assembly may help us understand how this has been assembled.
The sort of questions would be, is the end of the axle shown in the photo the same diameter on the other side of the steel bracket, what is that I can see which appears to have a hole in it on the other side of the bracket?
Beech.
