Live uses a weighing scale

Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.

Live initially focuses on getting as many of the screws provided to attach to the magnet as possible, before considering that other things might be useful. Noticing that the table is metallic, she asks Olli to help her lift it up to the magnet. However, it proves to be made of some non-magnetic form of stainless steel. She leaves the lab and returns with a sign, which is also not magnetic. She then tries a weighing scale, which does prove to be magnetic. Sticking with this item, she starts adding all of the provided screws to it for additional weight, eventually managing to build up a weight of 3kg, and earning fourth place.

(Written by Karl Craven)