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How did you connect the clip to the magnet?
I haven't tried this, but my best guess is to spread it out on parchment paper, on a cookie sheet, as thin as you can and put it in the oven, on a seperate rack, at the same time as you dry out the yokes. Then it should be easier to grind into a powder for the next time. (I'd use a cheap coffee grinder or MagicBullet/blender)
Look above in the questions area ;)
Tools + Materials
Beginner 3D Printing Class
Silhouette Style DIY Organization Board
Sounds interesting, but that is a lot of hardware $$, no? What do you think of a carousel instead? Peg board could be attached to both sides of a 2*2 frame and just mount half of a hinge on the top and bottom with a chunk of ready-rod running through them. Now make as many as you need and just flip them back and forth like looking through a pile of vinyl records or like when there is a poster display like this https://goo.gl/images/nbmRuS
Portable Hot Tub
Sous Vide temperature controller for $50-$100