Looking to close up an outlane just slightly...Is it acceptable to replace the metal bumper posts which have a 7/16" OD rubber ring with a plastic one that has a slightly larger 3/16" ID? Is there a physics reason behind why the manufacture uses one vs the other in specific spots? The reasoning is I'm trying to close the left outlane slightly on my SW Premium (the plastic post is all the way down, not in the picture below but now it is - smallest outlane opening) but still get a fair share of unfair drains. The metal one just below it which has the smaller ring would be the one I'm looking to swap with a larger plastic one. Are the metal posts where they are because they take more abuse or is it simply based on their size? Thank you very much all. I don't want to use the siamese post trick as it doesn't fit 100% proper.