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find a old harddrive and dissasemble it. there are some extremely strong magnets in there.

Thinking outside the box (no pun intended!)
Went by a place that refurbishes old PCs. Tech said magnets are strong but will only hold about 10 #s.

Went to hardware store and found these. Rated for 65# each... Magnetic hook
Of course, I will have to punch the centers out but these boogers are stout!