Used a diameter 4.5mm twist drill bit to make a hole through the cap piece...
The 2 parts of the cap piece has to be hot glued together now that the original screw joint is gone... I realized that super glue does not work quite well with this toy's material, not sure why...
Also used the same twist drill bit to trim the hole at the upper rim of the full bottle so that the pin movement will be smooth... Probably this step is optional, but, anyway...
The liquid piece consists of 2 halves and they are joined superbly tight that I cannot pry open without damaging them, hence I had to cut off the 2 pieces of 'spacers' (rectangular pieces with a notch) on both sides of the central stand...
... and slide off the liquid piece... Slightly trim the 2 cut-off 'spacer' pieces if there are a lot of sprues...
... Then hot-glue the 'spacers' back in place . This step can also be done later, after the central stand is cut into 2, as the lower half of the cut central stand also needs to be hot-glued back in place...
Mark out on the central stand piece the end point(s) of the liquid piece when slide up, DO NOT cut at the marked point.
I cut the central piece at about 5mm above the highest marked point, so that the lower part of the cut central stand will still be inside the liquid piece when the liquid piece is slide up... Recommend to cut at 4mm above point, as 5mm will leave the upper central piece a little teeny bit too short (still workable though)... Trim with file r penknife...
The top circular piece of the upper central stand half is cut off, for better range of the liquid piece movement... Trim as needed...
Next is the most tiring part... Trimming the upper central piece to around 4mm in diameter... The central piece has actually 4 long flaps extruding from the central axis to eventually form the rod-like piece. 2 of the flaps are wider and has to be trimmed (cut along the length roughly 1mm away from the edge), and then file to smooth... takes a lot of time and effort as the piece is very small and hard to hold on to when filing...
Once done, test taht the upper central piece can pass through the necessary holes, then hot glue to the correct side of the liquid piece. Keep it as centre and right-angle as possible...
Once done, assemble everything (yeap, you will have 1 unused screw now), and check the upper central piece will not protrude out the cap, i.e. flushed. For this one shown in picture, I actually added a bit of hot-glue on the tip as the piece is a teeny bit too short... Result is quite satisfying, seeing the liquid pieces move like the DX version when activated in the DX Build Driver...
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