Great idea Jim 
and very nicely done 
I’ve tried adhesive magnets before, but these burners get very hot... does the base of your holder get hot or is there enough metal for the heat to dissipate?
Nick that was my thought behind using aluminium in the top half and brass for the bottom half (the brass join at the bottom is silver brazed) still deciding whether to cut out some square sheet brass for it to sit on.
I don't think from my short testing that it will get hot enough to scorch the hardwood.
Just for reference, the three metals that you've used are among the very highest at ease of heat transference through the element. Silver is about as high as it gets, so your silver soldered joint will pass the aluminum's heat through to the brass base very efficiently. Brass is mostly copper, and copper is an excellent heat transference material, with aluminum being only slightly less so. If you want to insulate your burner from the base better, but still wish to use metal, then plate iron or steel would be good choices as their thermal coefficient are quite low, which is why a blacksmith can grab an iron bar out of the forge that is glowing white hot, and still hold it in his hand (hopefully gloved) only a foot away from the glow. Glass also would work fairly well from the thermal standpoint, if less so from the structural. Perhaps just a sacrificial piece of wood in between would be a good alternative as it generally has a low thermal transference, which is in part why the Russians used oak as the re-entry heat shield on their earlier space capsules!
But in point of fact, you will likely be just fine with the set-up you already have.
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