This part is completely different from the one that came with my Dremel 4000 from the factory. At first my dremel didn't work at all. Try what's left of my old original brushes and my tool worked great. This part is not a suitable replacement and after the strange engine noise and smoke I really hope it is not damaged. The springs are completely different and do not break the right connection. I feel like a cheated burglar and maybe worst of all my whole instrument is ruined. Definitely not the right part for 4000
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