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If it's not down tight enough though then it will cut the holding screw or grind out a big hole in the center of the wheel. From what I can asertain I am supposed to stock up on dremel mandrel screw downs at 3$ a pop and let it cut through it's own holding screw. If your screw driver slips and goes past the screw too fast it will shatter the cutting wheel.It astounds me that they would have such an unstable method for holding the cutting wheel in place. For some odd reason dremel doesn't provide washers to help hold cutting wheels in place. I did manage to cut through my rusty bold, but had to replace the wheel because of the center hole damage.The second cutting wheel cut right through the teeny tiny screw holding the wheel on the tool. I was hoping that dremel made something better than this, but apparently not. (Can we get around to actually cutting the material in the project).Also, be careful when tightening this down. I would have thought after the number of years on the market they have had they would have improved on the method of holding these wheels in place.
The first cutting wheel I used ground out it's own center hole too big to keep the cutting wheel even. It is a pain to tighten this thing down because the screw is so small. A broad flat surface such as washers or a flang of some kind on the end of the tool to support the wheel would be a big improvement. The cutting wheels are so fragile I am affraid I am going to shatter the wheel if it's down two tight.
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