The finger grooves are laid out by holding the unfinished knife in the hand in the normal cutting position. The powder solvent will 'loosen' stubborn residue remaining in the bore that is invisible to the naked eye, having found its way into the very pores of the steel and therefore must be literally soaked loose. Prada Platforms Gold. In the case of a rifle scope, slit the material just enough for the lenses to be exposed. However, fantastic shapes and bulging contours have no practical place, unless one is entering his contraption in a pop art contest! Prada Platforms Gold. However, the basic methods pertain to all sights, whether they have ivory, gold, brass or copper beads. Even complete barrel rifling guides and tools where hand manufactured from any available material. Prada Platforms Gold.