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Put screw drivers in the "handle" loops of the tools and pull hard! Sometimes it help to push down on the front of the radio while pulling. You cannot remove the tools until the radio is out.
You guys are the best. I did exactly as instructed: I put a towel over the shift stick (in case it came out quickly - so I didn't damage anything), put screwdrivers in the keys as handles and have a good firm tug.
It slipped right out.
Glad it worked out. I recall wearing leather gloves when I pulled mine out. It's amazing how much less force it seems to take when the removal keys are not cutting off your fingers!
I also had a bit of trouble getting the radio back in. Spraying a bit of WD-40 definitely helped, as well as getting the wires not to block the rear of the radio.
And just a bit more info for anyone who stumbles upon this post trying to add AUX IN to their CDR-220:
Once I pulled hard on the keys and the unit slid forward I gently slid it as far out as it would go. In my case that wasn't quite out of the dash but far enough I could angle it about 45 degrees sideways and see the connectors on the back. My view wasn't really clear of the back of the unit but good enough that I could figure out from the diagram that came with the AUX IN cable (eBay purchase) to know where to plug it in. The cable snapped right into place easily.
I wanted to feed the cable out the back of the dash into the foot well on the passenger side. I didn't like the idea of any cables hanging down near the drivers feet. I tried getting the cable out the back that way but couldn't make it work. It was too tight and I couldn't feed it through that way. I could see daylight out the out the back left corner into the drivers foot well though. I used a stiff wire (I cut and straightened a coat hanger) and by taping the aux cable to that wire I fed it into the drivers side. There is a 1/4" gap between the upper dash that holds my radio and the lower section that holds the CD holders. It just fed the cable into that gap and let it drop into the passenger's foot well. Pretty easy overall.
Turning AUX on was easy (I won't write the instructions here as they are well outlined elsewhere.
It works great with my iPod. With my iPhone it picks up quite a bit of electronic chatter (sounds like an old fashioned modem) unless it is put in "airplane mode". My stereo at home will do the same thing if the iPhone is too close.
So in summary, except for the hiccup of not knowing I just needed to get a better grip on the keys and pull HARD it all went smoothly and was a cheap, quick, effective upgrade.