Here is one from Blender's gallery:
When you do yours with the Corona, you are going to get more flour. But that's OK. The whole trick with a Corona is to grind a bit into your hand, check the crush, then adjust the knob on the front, repeat. Once it looks good, set the nut and don't budge it unless you know it needs tweaking. Corona's do an OK job, particularly if you batch sparge, but they aren't as 'user friendly' as an adjustable roller mill.
Also, don't be afraid to make the crush a little finer and finer each batch. When you finally hit one that gives you a stuck sparge, then back off a wee bit and you know you have it.