Don't know how to get the various attachments on and off the tool

This might help

http://mdm.boschwebservices.com/files/2610031433%2008-13%20225%20r120156v3.pdf

find the little square attachment and place on the end of the dremel tool. I didid the same thing. Worked fine after I put the other part on.

It doesn't attach anywhere, that's why it popped out. It should just fit in a recess, pushing the lock button outward.

hello. You loosen the arbor at the base of the shaft closest to the tool. There is a tiny wrench in the kit that came with the dremel, or you can use a pair of pliers to loosen it. Joe

I would go direct to Dremel.com or call them at 1-800-437-3635 and get the schematic and parts you need, I just checked and they have a parts diagram online that you can view. go to the section about manuals/literature and type in your model number. Good luck

Dude!!!!!! This is NOT a Chicago tool nor is it pneumatic! Chicago tools are air powered. This is a rotary tool. Looks like a very nice one at that. The world leader in rotary tools is Dremel. Although the tool you have is not a Dremel. I am going to direct you to their website as they have a great introduction to rotary tools, they explain how-to and give details on all of the attachments and what they are for. They are also explicit on safety and give detailed safety instruction. I personally have four different Dremel tools and hundreds of attachments, if you need any advice on any of things please feel free to contact me again. This will Fixya!
http://www.dremel.com/en-us/customerservice/gettingstarted/Pages/default.aspx

You can either go to Dremel.com and type in your model number for replacement parts or call their toll free number at 1-800-437-3635 and get that information. Let me know if you need anything further

Rotary tools can be divided into two types— Cut Out Tools and Basic Rotary Tools. The biggest difference between the two is the size of their motors. Cut out tools usually have larger motors.