What are the items that the single-head tube preset uses to pay attention to things?

(1) The gap between the outer diameter of the model single-head tube and its inserted aperture should be changed from large to small as much as possible. Generally, the gap between the two is less than 0.1-0.2mm. For example, a heating rod with a pipe diameter of 10 should be the pipe diameter. Aperture within 10.2.

(2) When machining the mounting hole, it should be effective to ensure its coaxiality and volume tolerance, such as using a reamer and other tools to trim the machining.