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A combination of a couple online, I have some Forstner drill bits to sink the magnets in the back as opposed to routing a continuous hollow. I just checked my email and I spent goddam £60 on magnets so I must've thought I'd recoup when selling, idiot. https://www.first4magnets.com//circular-disc-rod-magnets-c34/20mm-dia-x-3mm-thick-n35-neodymium-magnet-3-6kg-pull-p6199#ps_1-6759/s6759
Each piece of that oak is 2' long though cause I've got too many knives that I refuse to chuck.
I'm half way through but the house move has put it on hold. Bought the oak, ripped it to size and oiled. Needs proper sanding and finishing. Bought the recessed mounts and rare earth magnets too. I'll probably keep two and sell two, need to build a kitchen first so don't hold your breath.