untwist the sakura all the way. when you do this, youll see a line running down the legnth. get an exacto knife and cut along this line. do this to both sakuras, then put the 2 different colors together and put them back in the tube by gently pushing into the tube while screwing the bottom back in. After its all the way in, what i do is run it over my stove fire for a few seconds or so to bond the 2 seperate pieces together, then i throw them in the freezer overnight to make the bond firm and solid.