I've created a few more of these, as the myrtle version I had posted on my etsy site went viral last week. Two of these sold this morning. Actually, this one was the first to sell, no small wonder as the grain has the most WOW! of all of them.
I created a channel in the backside of the piece to embed the magnets( I used ceramic Ferrite block magnets), then refilled the open space with more tight fitting pieces of walnut, which are glued into place for maximum strength.