Here is a quick tip for those who want to make a 5-sided screwdriver to remove Disco 1 radios. I originally tried filing a rod using a hand file, and that didn't work very well. I was having a hard time getting the shape right. My second attempt worked like a charm and only took a couple minutes. Here's what I did:

First, I used Microsoft Word to print out a pentagon shape using "basic shapes" feature ...and dragged it out to about 1 1/2" or so.Then I glued it to a piece of heavier tag board and let dry (couple minutes). Once trimmed down, this gave me a basictemplate to help get the angles and shape right. Then, using ahot glue gun,I gluedthe pentagon templateonto the back of a tiny phillips screwdriver,which I bought at a hardware store (smallest one on the rack). I proceeded to cut the tip of the screwdriver off with an aircut-off tool andthen ground the tip down keeping my grindsparallelwith each side of the pentagon template glued to the handle of the screwdriver. I used a belt sander and only had to "touch" the screwdriver onto the edge of the belt a few times, but any grinder or file system would work so long as you stay parallel to the template. I got mine correct the first time.Fits perfectly. Once finished, I removed the template and glue. The whole process of cutting/grinding couldn't have taken more than 15 minutes.

For first-timers, you don't need to back the screwsout all the way, just loosen them. As you loosen the screws, it retracts an adjacentretaining tab on the side of the radio. Once the tab has been retracted enough, you can pull the radio out. Mine took a little tugging asit probably had not been removed since it was originally installed. Fortunately ithad a cassette option for sticking my fingers in.

Hope this helps.

Mark G