@@T0mm3mon22 The elder one used a nail to fix the tube, but it's not designed to be easily taken out, so I don't think you can switch the liquid tube yourself. as for the tube, I'm willing to provide you a free one, if you can change it yourself, just cost a shipping fee, like 6USD I guess
Really got to give you props for this project @LeonesMarvellousItems. The product looks stunning! Can't wait for the finished design, already pre-ordered one!