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The disc was severely bent when I got it. I clamped it to a board to get out the lopsidedness. The aluminum metal thickness is pretty thin. I have to take off the inner hub to try to straighten the 4 inner concentric circles. A you can see there are 4 alternating rolls of extended, depressed, extended, depressed. Once the center hub is off it should lay flat on a board where I can press down on the depressed circles then flip it over and press down on the other two circles. The internet says they two best methods for straightening aluminum is pressure and heat (Iron). There are spatula shaped attachments for regular electronic soldering irons (about $6). There are also complete miniature spatula shaped irons for the clothing industry (about $14) for cuffs and laces etc. It would be easier if it were a flat without grooves 17 inch disk then I could use an ordinary clothes electric iron.
I am only trying to get it to a presentable appearance and not true straightness for functionality at this time. I have a complete Visionette receiver which I purchased at an ETF auction several years ago. That one has a disc in good functional shape.
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