The magnetic drain plugs I have in my cars/motorcycles I bought online. The end where the magnet goes has been drilled out before putting the magnet in and epoxying it.
It seems a little safer to me that way and with my luck I'd make my own and the magnet would come loose and tear up the inside of the engine..?
So drill yours out! Unless your motor needs to put a man on the moon, don't worry about it! Your China made drain plugs probably are not even glued! The magnet just sticks to the plug. Dont worry, and don't try to overthink this! You'll be fine!
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