If you have the standard dremel tool ther is a small bar sticking out at the collet end of tool. This is a locking rod to hold motor shaft in place so you can loosen coollet nut. Put pressure on thebar and slowly rotate the shaft until the bar drops in place. There should be a small open end wrench that comes with your tool to loosen nut. If not use asmall wrench to loosen nut.Turn it counter clock wise to loosen. It is not needed to take the nut all the way off. You may have to move tool slighyly to get it to come out.
The tool that you use is determined by what job you are trying to do.Most come with abrasive cut off wheels small grinders,sanders,and polishers.To secure new tool in collet just insert tool shaft in collet and tighten down. When it gets snug then Depress locking bar to finish tightening. Hope this helps you some. Thank you.
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