Hi Artin,Ha ha , the 95 dollar rotary tool I got from Amazon labeled Marathon made in Korea lasted 2 days. The thing overheated and cramped out on me.
Time to go and get the real deal sold by Fordom
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It might just be bad luck with Marathon... I have been using it for more than 10 years, quite excessively, without any problem at all. Actually I am wrong: the speed control foot pedal gave up after a few weeks, but I have been using the unit since then with manual speed control (the knob) without any problem.
János