Smaller Tube Squeezer

Based on Tube Squeezer by Starno http://www.thingiverse.com/thing:1009, it is scaled by 0.9 at X and Z and 0.7 at Y, printed at .3 mm/layer in PLA it fits very tightly on our household's toothpaste tubes.
I do not know how to make the slot thinner without altering the overall geometry of the model so this modification loses much of the appeal of the original in order to get to squeeze that last bit of toothpaste from the tube.