The blade assembly on my dremel will not come off. Is there a trick to this?The coupling seems to stuck.

This should offer blades of various lengths:

https://www.lowes.com/pl/Dremel--Saw-blades-Power-tool-accessories-Tools/4294607793?refinement=4294965332

https://www.amazon.com/dremel-scroll-saw-parts/s?k=dremel+scroll+saw+parts

You should stick to cooking and making babies maybe

You can't attach this to a Dremel Stylus. This blade is specifically for the Multi-Max tool. A link is below.

http://www.dremel.com/en-us/Tools/Pages/CategoryProducts.aspx?catid=2094

You will likely need to replace the beaker anyway, the drive which is now melted to the motor coupling is only supplied as part of the beaker/blade assembly. You will also need a motor coupling.

I believe the part you are looking for is called a "locking rod" dremel part number 2610922661, this is the black painted pot metal that is about 3" long attached to the upper arm rocker with a parallel pin, and the flip clamp (blade tensioning assembly) or it could be the small piece attached to the tension assembly that the blade attaches to which is silver and called the "blade holder assembly-top" part number 2610922683. I would recommend ordering both directly from Dremel CS 1-800-437-3635. I broke the locking rod on mine. I emailed dremel, and they emailed me back the next morning with a schematic, and parts list. I bought 2 and paid $10.41 total.

hello. yes. go to dremel.com and get new brushes for your tool.
ps kindly rate my answer as helpful. thank you. Joe

You need to have a blade installed... the unit locks itself when there is no blade

Replace the blade assembly immediately. They are available from Cuisinart's website. Sugars and other stuff can gum up the blade assembly over time, so it will periodically need to be replaced. A quick and easy way to keep the blade assembly clean and working longer is to put water and a drop of dishwashing soap in the blender after use and run the blender at low speed for 15-20 seconds - an old Osterizer trick.

Trying to fix a similar issue. The pin that gets pushed in by the button (and returned by the spring) seems to be fine. The hole in the rotating shaft that the pin fits into, however, is in the wrong place, so the pin never goes into the hole! All I need to do is somehow pull the whole front part of the shaft out about 1/16th of an inch, and it'd be fine. I just can't seem to budge it though. Any tricks, anyone?

I would suggest calling Dremel direct at 1-800-437-3635 and asking for tech help. You might also try their website at Dremel.com, but I have been there and you need to know the exact model number. Let me know and I will dig deeper.