The first option is the easiest. Take a stronger magnet and tie a thin thread to it. The finer the better.
The second option. We take a bowl of water, a marker, a knife, a magnet and a foam plate from the floor of cookies, meat or another.
Cut the gap with a knife and insert the magnet.
We put on water and check the performance.
Next, write a direction with a marker.
Everything is ready.