Over tightening can cause the barrel to break. A little trial and error the first few times will enable you to seat the components properly without distortion. With a damp cloth, remove any excess white adhesive that may have oozed out. Prompt removal of the adhesive will prevent any staining or marring of the work. The top is now complete.
Press fit the tip into one end of the other barrel.
Press fit the mechanism into the other end of this barrel, inserting the brass end into the barrel. Gently, firmly push the mechanism in until the etched groove just above the brass portion is barely visible. Conversely, if you do not insert the mechanism far enough, an insufficient length of the cartridge will show. You can correct this latter problem by simply pushing the mechanism in a bit further. If you go too far, however, you will not be able to pull the mechanism back out without damaging it.