DJ's souved and dissected Weller carcass should be retrieved from the
---Bin Of Unfused Shame--- and reassembled with a suitable 120/120 CT to 24 volt isolation transformer
($35 to $60 depending on VA requirements > any decent cheapie tranny should be better enameled than the honey coatings on the crusty deceased one,
and come stock with a thermal fuse fitted with a -MUST- recommendation to use a primary fuse and the value. Reference: Altronics and Jaycar catalogues)
kit it out with a cheap glass fuse,
wired/connected for 120 volt operation
then plugged into 240 volts and see what happens
Then swap out the zapped fuse and connect 120 x 2 for 240v, and see if it still works
All proceeding posted on Youtube of course
with optional Grande Finale plugged into 440 volts (2 active legs/single phase) with a
very temporary 3 phase plug to GPO socket
death adapter
I'm betting a properly rated fuse will pop faster, perhaps crack or shatter, and the unit will survive unscathed and back to work