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You have a few ways to do a magnet on the plug. First is to see if the plug is ferrous based (iron). This is magnetizable of course. You can take a screwdriver magnetizer and pass the plug through the magnetizer a few times and it will be magnetized. These can be had for cheap at sears etc. The second way I can think of is to find a small circular magnet wafer thin, cut it to fit inside the drain plug on the outside (dont want to have the magnet fall off inside the case), and glue it down. The third thing you can do, is have a custom iron plug made, it may be common pipe thread, and magnetize it. The problem with that though, is that steel and aluminum slowly react and for a white deposit that can 'weld' the two together...
I would just get a wafer thin magnet and glue it into the hex plug on the outside.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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