Too bad, the clamps are zero!

Too bad PROXXON have chosen a gripper system as bad for this device: it is not a game of continuous diameter clamps, they can be used for the precise diameter to which they correspond (2.35 to 3.0 - 3,2 - 4.0 - 5.0 and 6.0 mm). Moreover they are "tight" if your forests have a slightly embossed marking they do not go!
So unusable drilling except to buy a classic mandrel which lost the benefit of the concentricity of the device, or forests grand "enhanced" hard to find and very expensive.
Apart from that, the rest is correct milling.