[Arran]

A lot of radios had a rubber, or brass grommet in the holes where they routed wires so as not to chafe the insulation. The horizontally mounted power transformers did not usually need this of course, leaving a rectangular hole in the chassis. I've been pointing people towards the power transformers AES sells as replacements in tube guitar amps as many of those are horizontally mounted, and for some reason cheaper then the generic replacements Hammond offers, which are all vertical mounted. I've found that preparation is more important then a steady hand for soldering, I have a habit of using fine sandpaper to polish up leads on components, and the ends of wires, using flux seems a good idea too. Soldering cloth wires is nasty sometimes, the rubber, or whatever it is inside, gets between the strands, and likes to melt black goo into the joint, one time I had to clean them with lacquer thinner just to prevent this with a transformer I was re-using. I never did bother with Fakebook, or Twatter, it's just not my thing, the number of "retired" Feds Elon Musk had to fire from Twatter was disturbing, meanwhile Meta seems to be lurching from financial failure to failure, not that I care.
Regards
Arran