I have two from Janty with no such modification - got them 4 months ago - no problem yet. I have one from Innovapor 3 months that has the 'sponge' on the top - no problem with that one. One of the Janty's gets daily use with my wife at work. The others - a few times a week.
I had one other one that was for autos and I tried to mod it for manuals and ruined it ;-)
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