I don't have any of the blue foam, so haven't tried it. However I have those flat green scrubbers for washing pots. I tried that as a plug and it works great. Got it right my first try. Doesn't leak or flood the
atty. This stuff is to hard to measure and cut. Moves around too much. So I just cut a stip about the width of the cart end and then cut a piece off of that a bit bigger than the cart. I just held the green scrub material againt the end of the cart where it goes with my one finger on top of the cart (mouth end) and one nail on the scrub material and then using good snips, I just cut around it using the carts' outside as my guide. Worked perfect. I made a dozen plugs that way. Have to be a bit careful. I gouged the cart end a teeny bit in one spot doing this. But it makes a perfect measuring guide. The thickness of the cart wall just gives the right amount extra that's needed to hold it perfectly in place. Don't see why this wouldn't work with the foam too. I also tried one using a paper punch. It comes out a bit smaller, but I tried it and it seems to work ok too. But for good measure, I made the rest with the cut around method. A bit bigger and a better fit.
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