****o this is Beth from Dremel. Your 3000 tool has an "EZ Twist" nose cap "wrench" for fast accessory changes. (Make sure you refer to your "Operating/Safety" Manual as well on page 9, under the "Assembly"). This page provides drawings along with step by step assembly of the bit into the tool. The collet that you have does not have to be removed when inserting the standard 1/8" size shank bits. It stays in the hole of your tool. So... to begin, make sure the collet is in the tool. Unwind the nose cap (at the end of your tool, again, refer to the diagram), off of your tool. Next, start to wind the collet nut
(black piece) onto your tool, but not all the way
, basically, just so it catches a little. Then take the bit you want to use and push it all the way into the tool. At this time, you will push down the blue (shaft lock button) and just hold it down. With your other hand, you will take the nose cap and invert it. (Actually, if you look inside of it, you will see a steel insert in it - this steel insert needs to line up with the collet nut). Then, again, while holding the shaft lock button down... tighten the collet nut with this nose cap. Wala... all should be tight.
If you find you have any further questions, perhaps you'd like to call one of our representatives at our Dremel Customer Service Department on our toll free phone number of 1-800-437-3635. We are available Monday-Friday, 8:00 am - 6:00 pm, CST. (We also now have "Live Chat" at various times of the day as well. You can see the icon on our website as well).
-Beth at Dremel