when cutting metal, its best to use the fiberglass reinforced cut-off wheels as mentioned. you can make 1 disc last a very long time if you just let the speed of the tool do the work (do not force it or put excessive pressure on it). it'll take longer to cut, but your discs will last longer (and those fiberglass discs are expensive lol)
i wouldnt put 2 discs on one mandel...it wasnt designed to be used like that.
and yes, ALWAYS where eye protection when cutting ur case apart; those discs do break, and it only takes 2 shard to blind you.
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