The repair went well, and I've been vaporizing without a hitch, but several things have happened since I've repaired my PD.
The original Jameco power supply which I had noted was running pretty high at 14v-15v died at the transformer [no more voltage from it]. I figured the previous high voltage reading was an indicator that it was about to give out, but I also noted that it died when I tripped on the power cord and send the PD flying to the floor.
Today I noticed my PD was hotter than normal, and when it combusted a bowl I decided to open it up and check. Didn't notice anything obviously wrong, so I closed it up and used two screws instead of one so that it would not be jammed against one side but centered in the middle [presuming that it would help it run cooler enough to not combust].
Smelled something funny a couple minutes after plugging it in, and found my replacement power pack was heating up and starting to bubble inside. I wondered if it was failing and caused the overheating/combustion [its a very old AC adapter I had lying around from an old item] so I decided to try another old AC adapter I had.
Bad mistake, for I killed that one as well. It turns out that because the PD doesnt use plastic insulation in its wires [to avoid inhaling plastic], it is at risk of shorting out the circuit.
What I figure happened is that the bottom of the PD is drying out as well, so the metal piece has been slipping lower and lower, and it went low enough to cause a short circuit.
LESSON LEARNED: After working on the PD, check the connection on the PD with a MULTIMETER, checking for OHMS. If it is around 20 ohms, it is okay, if it shows zero ohms, it is a short circuit.
If anyone out there has a PD that is rattling around, I strongly suggest unplugging it, using screws on the inside to stabilize the piece so it no longer rattles around, check the connection with a multimeter to make sure there are no shorts, then replug it. It is possible some peoples AC adapters are being fried or damaged if the PD rattles around and causes temporary short-circuits.
Extra odd item: The resistor I ordered is now 22 ohms, not 20. The other 2 I had ordered are still at 20, so I decided to replace my 22 ohm resistor to get it back to 20... I'll keep an eye on this and see if it also 'wears out' as it gets older [I can merely test it with the multimeter without having to open the PD].