Development of a potato pulling device

[Summary] This time, instead of Disney's King's Sword, I'd like you to develop a potato that can't be pulled out. https://www.reddit.com/r/Disneyland/comments/1fs8mhm/my_first_trip_to_disney_i_pulled_out_the_sword_no/?tl=ja The size is up to you... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Rendering, Product Development, Sound Design)