#mechanical alignment

• Spacer — An intermediate fastening part, metal spacer, or structural bushing used to maintain a constant, strictly determined distance between two elements, plates, or components of a gear mechanism or construction framework. This rigid component prevents mechanical deformations under tightening forces.
• Focusing — The act of focusing or aligning and its result; a structural process through which an activity, a speech, a strategy, or a technical system is oriented, centered, and concentrated on a main objective, a central theme, or a reference axis. In engineering, it defines the precise geometric alignment of parts or machine elements along the same axis of rotation to ensure the optimal functioning of the mechanism.