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Rule #1 is surface contact; magnets work much better (stronger and more reliable) if they are in direct contact with each other.
You will want rare earth magnets (neodymium) and there is a strength rating system (N40 etc.). I can never remember which way the ratings go, but you can look it up online.
Never hit magnets; shock loading can cause them to lose their field.
Be very careful of pinch points; large rare earth magnets can be very difficult to separate. Also be very careful they can't be swallowed by kids or pets; they will tear through intestinal linings and perforated bowels are no joke (and neither is this warning, deadly serious).
I normally use a pin vice for magnetising infantry, but for this job you're going to need bigger magnets I think. A Dremel type drill would be good; to be honest the few times I have done larger holes I have ended up using my hand drill on its slowest setting to allow control. Just make sure your model is well restrained so it can't spin or slip.
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