If I understand this correctly, it looks like the restrictor is actually a thinner waist of plastic and you are saying that you used a sharp knife blade to cut the top part of the waist all the way around. Here is a couple more questions: I assume the part closest to the external opening stayed there, but the lower plastic was parted from the upper, what happened to it, did it slide down the pipe? or did you rip it up out of the opening with the pliers?
Thanks for this info
Brian
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