Why magnets? Could you use some velcro strips? Easy to apply/remove, will level fairly flat, cheap and significantly less effort than magnets... or am I missing something?
While drafting an unnecessarily sarcastic response I came up with a much better idea.
G clamps.
When you Google image small g and c clamps it turns out that there are some quite refined ones.
The hand knob could easily be replaced with a cut down button end hex.
@hugo7 started
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Why magnets? Could you use some velcro strips? Easy to apply/remove, will level fairly flat, cheap and significantly less effort than magnets... or am I missing something?