Purely an academic comment.

The oxide is inside the tube, while the magnets and heat sinks are outside the 
tube, cradling it. They aren't 
even attached. When you grind off or unscrew the screws holding the heat sinks, 
the tube itself remains 
intact and the magnets readily slip off the outside.

Have a look for yourself. Point taken though.

Duncan

> >I'm not an electrician at all but I found using the high-voltage wire and 
> >bypassing or removing the magnetron
> >easy to do. The magnetron can be broken apart to give you 2 useful-sized 
> >ceramic magnets for magnetizing
> >water
> 
> You are also obviously not aware that magnetrons may contain beryllium oxide. 
>  Usually seen as a fine white
> powder which WILL irreparably damage your lungs and lead to an early death if 
> inhaled.  Because of the
> possibility of BeO or other toxic materials, you should not physically open 
> high power tubes of any kind
> unless you know EXACTLY what you are doing (In which case you wouldn't open 
> them...). Whatever parts you might
> scavenge from these items are not worth the risks.
> 
> Regards,
> George Martin
> 
> 
> 
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