Fitting Locking Magnets to a Strida 2?

Hi

I recently brought a Strida 2 and absolutely loving it. However, to learn that later models have magnets to hold it in the closed position is a great evolution. Has anybody retro fitted magnets to their Strida 2 (or 1 I guess)? If so, can you please tell them where I can buy them from and how to fit them?