Desafio de teste de vibrador. Qual seria o melhor dos melhores?

Video screenshots

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Do I have many toys or few? In this video, about 30% of my collection) At least this is what has a suction cup, a lot without it, and I could not figure out how to fix them for the test. Therefore, I am testing only a part this time. Do you have any ideas how to fix without a suction cup to this board - write in the comments)