How best to eliminate LP warps

@lewm 

Sorry, I didn't mean to imply that the Koetsu was perfect. Although, it may be for all I know - all I do know is, that it's close.

I just meant that after optimizing azimuth by ear, a 6 minute change is clearly audible. Since my arm wand is artisanal and a one-off, it's almost certainly out more than the cartridge, and all that uncertainty led me to construct for adjustability.

I don't like to adjust for electrical measurements because, according to Peter Lederman of SoundSmith, many of the better cartridges have excellent separation on one channel but superb separation on the other. Equalizing crosstalk can lead to a stylus at an obscene angle, and that was indeed the case with the K.

Which is why I now adjust by ear. YMMV.

Back when I had an extensive vinyl collection I used 2 pieces of plate glass.  Put the record between them, set the sandwich in the sun early in the morning and retrieve it at night.  Here in the desert southwest it worked like a charm.

@piaudiol The use of an environment using the available Ambient Heat and not using heat applied as a point source or forced heat, is as said earlier, a low risk way to accelerate the reforming of the Vinyl Disc.

Sunlight Directly behind glass can reach 60 Celsius, so a Thermometer used to select a position that is creating a Temperature between 20-40 Celsius will be a lower risk method. 

Your success with creating the wanted reforming of the Vinyl Disc within a short timescale is good news and should serve as a guideline for methods that will create an ambient heat to assist with the reshaping.  

The best way is the AFI Flat record flattener. However it is also expensive.

@edcyn, you nailed it. Bowie was heavily into cocaine at the time and he was loosing it at times with severe paranoia. A lad insane.