...Also allows for safer 150C hot air treatment to reform the ABS to factory on all those edge dings. Something I learned of recently ![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
...
How about credit where credit is due? I mentioned this technique in
TiN's K2000 thread here. I came up with this crazy idea one day, decided to try it on a Keithley 199, and it worked like a charm. I am certain that I am not the first to do this but I hadn't heard of anyone doing it.
Here is an example. I fixed up a Keithley 7001 panel yesterday, including de-yellowing and fixing minor dings. These are very minor dings but I wanted to post up some pictures. I have fixed far worse.
1. Panel with lens removed, yellowing of the ABS plastic is quite evident.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223816;image)
2. Panel after ~2 hours in the sun with "40 volume" strength gel Hydrogen Peroxide hair bleach, brushed on straight from the bottle.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223818;image)
3. Small ding in a corner.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223820;image)
4. Ding removed with hot air, set to 170
oC and high fan.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223822;image]https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223822;image)
5. Two small dings in side
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223824;image)
6. Removed.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223826;image)
7. Side-by-side comparison with a unit awaiting restoration.
![](https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?action=dlattach;attach=223828;image)