I would suggest using smaller magnets, as 5mm or larger I usually use for dreads/knights/vehicles; DO NOT use dremmel on your models.
I suggest 2mm round x 1mm thick, 3mm x 1mm, 5mm x 1mm, and 3mm round with 1 mm hole Ring type magnets. Get yourself a hand held pin vise or 2 with many drill bitz, you may break a few drill bit tips at the beginning so wear eye protection.
the magnets you can get on ebay fairly easily and cheap; they usually have a N35 or N50 number attach to it, the higher the N#, the stronger the magnetization. Always get the 1mm thickness, as anything that need thicker you can always glue them back to back.
Use a marker to mark one one side of your magnet and keep your magnetization universal through out your models. Sometime you may find yourself drilling a hole too shallow for the mag and applied it too soon, no problem, drill a small hole next to it and use a metal jewelry file and pry the magnet out.
The Ring type magnets are use for area that require extra strength, like a IK waist or arms, you simply drill a hole deeper where the ring hole is to glue in a pin.
If you are worried about drilling off centered, use a smaller drill bit to attempt centering, once centered, use a bigger bit over the hole as a guideline.
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