1.Remove the top burr carrier completly and clean everything out (helps to prevent finding a false zero).
2.Now screw the top bur carrier back on and all the way down till it binds on the botom burr. At the point if you manually try to turn the bottom bur you will feel resistace of the top bur on the bottom one.
3.Now unscrew the top bur just a tad to allow the bottom bur to turn freely.
4.Switch on the grinder (hold onto the top burr cause if it touches the bottom burr the bottom burrs direction of travel will cause i to tighten).
5.Now slowly tighter the top bur again till you just hear the burss kiss. Dont worry about wearing the burrs if you look at their designs they are flattened where they make contact. Switch off grinder.
6.You now have your zero point.
You can now replace your hopper. Note that the hopper can be put on in only three positions so choose the one that has zero as close to your grind indicator. Because of this you cannot have zero actually at zero unless you are lucky. Case in point, my rocky has "zero" at the 4 indication.