Andrew Scherer's pump holds lessons beyond the peanut butter it's meant to dispense
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"Thanks for the write-up! I'm the inventor. The sliding airlock has a design similar to a suction cup, so that the vacuum will cause the outer portion to flex downward first, to do a good "mop-up" of the bottom of the jar/bottle. Manufacturing quality will be key, and I'll do my best."
"How do you do that? It might add too much complexity for the first production run, but I'm in the DFM process now, and if you have an example product to point to, I'd appreciate it. Until then, it's all manual. Thanks!"