I understand the adhesive on these feet may not be strong enough for some people. My legs stayed firmly connected. Secret? I'm a bit more careful with my laptop and I also waited a week after attaching them before using them - and my laptop stayed in a neoprene sleeve which was able to add extra pressure during that week. After removing my laptop - the Lenovo Flex 4 14" - from its case, the legs worked great. I was more concerned about a better typing angle on a laptop keyboard than I was about better cooling significantly improved.
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