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i always vape with solo upside down so goodness will flow down...and i stand the stem up while it cools so it'll flow down...i spin it sometimes layin down to help it spread even...simple really...
edit: and oh ya...the clean part on end is because it gets fluff at end from...
i'm going to do the same thing with my straight stem i broke day after cleaning it...except im going to try and cut the glass screen part off nice and neat with a dremel and then drop 2 screens down in it like that one....
idk says
"Liquid chilled tube 18mm
Take the harshness out of a hot hit, and cool it with this liquid chilled, black light reactive tube w/ 18mm phat female joint. Can be used with vapes and other glass adapters and accessories."