Product review (1 stars): Wrap the pins with tape on the outside to create a cavity into which you can poor the epoxy
Basically the only way to fix this part is to take the rollers off and to fill the pins with epoxy. Wrap the pins with tape on the outside to create a cavity into which you can poor the epoxy.  You will have to work it in with something pointy to get the epoxy all the way down to the base of the pins.  This will create a solid post.  Put the wheels back on after epoxy hardens.  Also, you may be able to salvage your original part if you find the pins that broke off. Just glue back with epoxy and fill in with epoxy between the pins.  There is a much longer detailed review/instructions from another customer on how to do this.  I think they make more money selling these parts than actual dishwashers, this part will break every 6 months if not glued.