I used one of those very thin (business-card-size) magnets and stuck it to the outside. (You can use the ones that come as a product promotion and cut it to size.) Watch the magnetic fields.
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It's handy for keeping the needles inside the metal tin.
These make GREAT gifts to homeless folks, AND for keeping one for the car and camping/traveling. I'd add a tiny pair of folding scissors or a SAFETY COVERED straight-edge razor blade for cutting. Going a step further, one could thread several needles in different colors of thread as is sold in local stores in a package for about $2.00. Saves a lot of frustration when away from home or if having poor vision. God bless you. : )