How to fix? Clean cup and surface moisten press firmly remove bubbles apply pressure re-moisten or replace if needed
QEP Pro MAXGrip Double Suction Cup 75013 - The Home Depot
Dia45mm adams medium suction cups with screw and stud nuts
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Aërial Navigation, by Albert Francis Zahm—A Project Gutenberg eBook
Suction Cup without Hooks, 20mm
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suction cup with screw -- Made Of Kingfar
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Sticking Suction Cups to (some) Non-Smooth Surfaces : 5 Steps (with Pictures) - Instructables