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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.
Ah nice. I wonder if I could have a go at making one with some of the leftover oak worktop.
Is there a guide you're following?