Paul writes in with a use for his Aussie Magnets:

I built a display box for a collection of knives I am proud of and used your magnets to secure the knives against a tin backing covered with felt. Very effective and the knives can be easily removed for examination and discussion.

Choosing the right magnet for this job is no easy task:

• Since tin is thinner than steel, the effective pull strength of the magnet will be reduced
• The felt layer will further reduce the strength of the magnet, since there is a greater gap between the magnet and the surface of the knife (strength decreases with distance)
• Knives are usually thin, hence a stronger magnet is required to maintain a strong hold
• The knives still need to be removed by hand, and hence the magnets can’t be too strong.

We’d probably suggest something like a 9.5mm x 10mm Rare Earth Rod, or perhaps a longer 50mm x 5mm x 3.5mm Rare Earth Block (depending on the size of the knives).

Thanks, Paul! Another great use.