ROFL at witch hunt accusations, Cadillac lane keep cameras, plastic versus metal car ramps, 'user error' stone throwing, scapegoat crucifixions, bandwagon jumping, safety belts,
keeping tabs and nagging the OP for repeating themselves over a 20+ page span...
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If companies like Behringer that make affordable gear can fit IEC sockets with labelled 120/240v flippable idiot-proof fuse holders (I'll have to drum up a picture asap),
EDIT: picture posted
Weller should have been on that wagon over 20 years ago.
I'm assuming DJ may have a 240 to 120 volt stepdown box or Variac kicking in the lab,
which would have come in handy -IF- Weller made some effort to label the unit
and or supply an incompatible IEC female to 120 volt plug cable,
or better still fit a ---FUSE--- in the thing too,
so all he had to do was 'DOH...!'
fork out a couple of bucks for a new fuse,
plug the recovered unit into the stepdown or variac, and continue on
WORST CASE SCENARIO
Had it been left unattended and caught fire in a business complex, or in a stacked shoe/dog box apartment tower,
let's talk about the price of lives and property versus the price of a fuse and thermal cutout.
The only 'user error' here was failing to suspect the
possibility of penny pinching that's wormed it's way into a reputable brand,
or 'Weller Error' in the design of these particular units,
hey **it happens, we understand > just FIX IT
and clue up the PR department in correct damage control procedures for now and next time,
so all can be well (er) again,
and the issue blows away...