Taking apart Monster Mill

My shaft on my MM2 broke completely off. Does anyone know how to take the roller off? It looks like an allen wrench hole at other end of roller but, nothing is fitting. Need to replace it ASAP!

Took it apart and it seems the whole roller needs to be replaced.

I looked up parts for the MM2/3. Shaft and roller is one piece. They do offer a 1/2" shaft roller to replace the 3/8" shaft roller.