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You will probably need to force the blade off the shaft somehow. If you over work them the blade can partly turn and lock onto the plastic shaft sleeve. A Kitchen Aid Authorised repairer will have figured out a way to remove it by now because it's been happening for years. Expect to replace the blade or the sleeve or both, once it's happened it's easier to happen a second time unless you replace parts.
The blade will be stuck on the shaft and both will be damaged and require replacement. With that knowledge you now understand that drilling a hole sideways through the blade cap isn't wrecking anything you are going to use again. You can then get something into the hole for leverage. Here in NZ blades are under $20 and motor shaft sleeve is about $5. If you don't replace the parts it will happen again.
You will probably need to replace the sleeve on the motor shaft and the blade. If overloaded the shaft can spin inside the blade which wrecks the connection between them. Replacing both together is the correct solution.
The shaft sleeve (the one on the motor shaft) is likely damaged. The correct solution is a new shaft sleeve and chopping blade. If you do not replace them both together the one you do not replace will damage the other one again.
I phoned the 800 number at Cuisinart (800-243-8540) and the person who answered the phone explained to me what to do: Fill the bowl with the hottest tap water I have (but not boiling) above the entire blade (including the part that fits over the shaft). He said to pulse a few times, then try to pull it off, but not to expect it to work right away. He said to do this until it comes off and that it could take 1/2 hour. I did what he said, and the blade came off after the first pulses. But also, the water was pouring out all over the counter--leaking between the bowl and the base (possibly because my old work bowl is also cracked, but I'm not sure).
I was told that the problem would happen again, and that I needed replace the blade and the shaft (which is cracked, as he guessed), both of which are available from Cuisinart.
You can get parts from this company.
http://www.euro-pro.com/europro/productdetail.aspx?pid=E50ADA3D-BACA-44E7-9E78-05263C526241(Euro-Pro+Base+Catalog)
You can call them as well
For technical support, please call us
toll-free at 1-800-798-7398. Hours are Monday through Saturday from
9:00am to 6:00pm Eastern Standard Time.
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