With all the good reviews for this grinder, I had high hopes for its performance. in the chuck for a little over a minute before it loosens and slips out. These were good, almost new Blackstone carbide burs and I've tried a few of them. I actually bent one of the little sheet metal wrenches to try and tighten the collet just enough to allow it to sag a bit. but I'm not going to experiment with adding different collections to try and get a whole new tool working.
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